I am curious what your rotation is like. There should be no way you do more dps in UH pres if you are using your abilities correctly.
Edit: also in terms of why you want to be in FP over UH is that you will be using frost strike a lot and having it cost 15 less RP and having higher RP generation means its that much easier to use.
Only problem is that while 2h making sure you use Oblit with every killing machine proc instead of frost strike makes or breaks your dps. People like to spam frost strike and it is real easy to eat you KM's with frost strikes.
