Yesterday I finally got a HC WF seismic bore, I already have a HC WF fist wep in my main hand. (I'm an orc)
Now I've a dilemma I'd say, I'm not entirely sure about the expertise cap now.
Do I only have to reach 7.50% with my main hand wep(fist wep) or do I need to reach 7.50% with my off-hand aswell?
I never had this situation.
Will the off-hand not being at exp cap be a dps decrease?
I'm assuming I only need to have main hand expertise capped for my special attacks not to get dodged.
The difference will be negligible, auto attack damage is about 15% for total on most fights for most people! offhand damage is roughly half that, so about 7.5% of your total, if your dodge/parried 1% of the time then that's a dps loss of 0.75%.
If that doesn't make sense then realize that after you cap your mainhand expertise, you're only getting half the use out of further expertise.
Basically it's not necessary unless you have an excess of stats.
To be honest, I never saw anybody go for more than 7.5% (not counting tanks of course). It would require a lot of additional exp to cap your offhand and therefore those wasted stats you would reforge from (or not reforge into) are much bigger loss than the gain of 0% dodge/parry.