DPS in tanking spec?

I'm sure that many of you raiding Naxx+ have noticed that there are a number of fights which either need only one tank (e.g. Sapphiron) or only occaisonally need a tank (e.g. Grobbulus, to grab Fallout Slimes). Since I can't win every /roll to tank, there's a fair bit of time available for me to DPS in those fights.

What I'm doing right now is equipping my +BV gear and abusing the Libram of Obstruction/double-ShoR bug, with Righteous Fury off. I'm wondering if I should carry around my ret set pieces for this time (mostly about 13 ilvls behind my main set, with some variation)

I'd like to consider this scenario without the double-ShoR bug, since that's what the world will look like going forward. I'm wondering whether I should use Seal of Blood or Seal of Vengeance when DPSing. (I have the SoV glyph, so it's 10 expertise vs. extra damage from SoB) I'm thinking that SoB is probably better, though I haven't done the math on it.

Near as I can figure, static values for BV, AP, and Strength:

1 BV ~ 1.7 damage on ShoR every 6s, or about 0.28dps
1 AP ~ 0.07 dps (white) + 0.045 dps (HotR)
maybe 0.04 dps (Consecrate, if mana permits)
Judgement dps (0.045dps with SoB, 0.015 with SoV)
SoV dps (0.05dps)
1 Str = 0.14dps (ShoR) + 0.16 * 2.3 (AP) + seal damage

It looks a lot like strength is going to be a lot better than Block Value, with either SoB or SoV; 1 Str would probably contribute around 0.5dps or so.

What would the value of Crit/Haste/Hit/Expertise be in comparison? Should I strap on some high-crit gear, or is hit/expertise important to max out first?

I've never put together a dps spreadsheet, but I'm sort of curious what other people do, and what gear you carry. Pre-BC, I'd be a 0.5 healer if I wasn't tanking, but that kinda sucked. (and I'd usually put up SoW/JoW and smack the mob between casts for weak mana regen) I can definitely put the hurt out now -- as a DK who decided to bother me when I was doing the Wintergrasp dragon-arrows daily found out.

You'll do the most damage possible with your ret gear on, except you'll still wear sword and board for HotR and ShoR. The increased AP/Crit help out for this purpose. As for using SoB for this purpose, I would try to find the slowest 1 hander you can that still has equal DPS to your tanking weapon and use SoB instead of Corruption.
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You get more AP than str in ret set.
I do more dps in my tanking gear (mostly 200 ilvl epics) than ret in my ret gear (187 to 213 iLvl items).

i think what he meant was that you will have more attack power per piece than pure strength, with ret gear.

at pretty low gear levels, ret gear+sword/shield will do the best. as soon as you start hitting some naxx, you will most likely do more dps in protection gear. most of your dps is going to be ShoR.

Rings, necklaces and cloaks are more prevalent in AP flavor than strength flavor.

Here's a grand idea.

Wear plate DPS gear and tanking accessories to maximize strength.

I have a mostly-epic ret set, but I still find that I only swap in a few pieces of it when I'm doing prot dps. I'm thinking my old Coren's Coin/Autoblocker combo would actually be the best of my trinkets for prot dps, but I haven't actually tested that yet (I never remember to bring them).

There's a lot of Strength on tank gear these days, and we don't have the talents to support stacking Crit in the way that Ret paladins do.

I do tend to use SoB, at least on fights without a lot of raid damage, despite losing 10 expertise, just because it's hard not to run oom. That will nerf your dps more than anything else.
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using Seal of Blood and a slow 1 hander makes a big difference too. I found that my 140dps 1.6 sword was doing slightly less damage than my 110dps 2.8 mace.

I need to get a high DPS slow weapon now...

You're wearing the wrong Ret set if it doesn't have more STR on it than your Tank gear. Rings are usually an exception because they tend to lack STR sometimes for the DPS rings.

Honestly, I don't carry my ret gear with me. If I need to DPS while OTing I just do it in my tank gear with Hotr/ShoR and Judging and it works more than fine. But you will get more DPS out of the ret gear because you will have about equal STR which means about equal AP and SBV, and you'll have an ton more Crit.

maybe going to a super max SBV set might give the best returns, but I haven't tested it. I know I can get up to around 1800 unbuffed SBV with every piece of gear I have that has raw SBV, so that might make the best set since ShoR only has a 6 second CD. Especially if you were using both ranks, though I do not do that.
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with full raid buffs (I'm not sure how they factor in) I was seeing very modest dps increases from BV. Given I still believe that ret gear is better, i think it is only better if goes without haste or expertise (so hit/crit/STR only); otherwise I say BV gear would be the better choice. this is purely experience, i haven't looked at any number comparisons.

I carry my heal set for cases where I don't need to tank
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At 540 Defense, when the tooltip says you have 5.6% chance to be missed, you really have a 4.11%.