If my first FB procs, it just makes my next RS free which helps my heat management. I'm not wasting it at all. By the time I use my RP (right after the free RS) the internal 6 sec CD on the proc would have passed giving me a chance at proccing RS again.
This opener easily kills a undergeared players before it even ends and it does take a good chunk out of better geared players. Hypothetically if everything crits, we're talking 15k to 18k damage over 3 GCDs on an average battlemaster geared DPS/healer
Umm, yeah. Your wasting it... if you can't manage your heat stay out the kitchen bud.
rotation should be TD, TSO, IM, EF, RS, RP,RS,FB,FB, RS
and fyi... ED is a dps loss