If you're using the spreadsheet, and changing gems is a dps increase, then it's an increase.
Crit cap only affects white hits iirc, which is about 30-40% of your dps. Unless you have enough hit rating for the 27% dw miss chance, then you can still add hit to increase that damage as long as it isn't too terribly detrimental to your other stats.
I think the hard crit cap is something like 79% because of glancing hits and an inherent 5% crit debuff against higher level mobs or somesuch silliness.
Fight gibberish with gibberish I say!
