Starting stats:
10% d/p/m (assuming hit capped and some expertise)
30% crit
this leaves 60% hit if we ignore glancing blows (they will provide similar results)
Say you take 1000 swings and each swing hits for 1000 normal and 2000 critical.
100 swings will be d/p/m and give 0 dmg
300 swings will be crits and give 600000 dmg
600 swings will be hits and give 600000 dmg
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1200000 dmg total
Now assume you have imp. sotc up, reducing hit by 3% and increasing crit by 3%:
100 swings will be d/p/m and give 0 dmg
330 swings will be crits and give 660000 dmg
570 swings will be hits and give 570000 dmg
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1230000 dmg total
The increase in damage from what you were doing is:
1230000/1200000 = 1.025
Or 2.5% dmg increase (not 3%)
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