Sounds like your just having SS issues, at 1670 ss ive no issues doing the 6 f4 opener. Also if a thunder proc occurs after a hard casted t3 use the proc since its a gain over the the normal t3 and fire 4. You only let it drop if it re procs too soon.

Ice phase very occasionally yes youll cast f3 and not get all your mp back but that's what sharp cast is for and if its down you create contingencies.

Your expectations for what youre asking are unrealistic. If you really have to bite the bullet just cast a fire one . less dps > dropping enoch.

But again ive yet to have the plight you do