Fair warning -- don't sign your posts. Your profile to the left tells us everything we need to know. A reminder to also capitalize I.
I just caught up on the GH vs FH discussion and my take on it is this:
I think GH is just too slow, even with DF and the occasional haste buff. With the penance change i often found myself in a very uncomfortable spot and had to PS or PI to make up for the fact that penance and pw:shield was on CD.
This is especially true in pvp.
To work around it i don't use penance quite that often - at the cost of mana efficiency.
In a typical fight i would sometimes use FH up to 6-10 times more often than penance (pw:shield on cd of course).
Should i waste a penance cd just for the sake of efficiency or should i just cast FH as long as HPS is not the issue?
I like my playstyle in terms of really thinking about when to toss out a penance but on the other hand spamming FH with an occasional shield and PoM doesn't feel that great.
To make up for the hpm decrease, i heavily gem for Int. It has worked out pretty well and i rarely found my hps lacking.