Not accounting for BL. So add maybe 2-3% uptime Raid haste buffs doesnt give increased HoPo generation as our spells GCD do not scale with spell haste, and the melee haste buff only affect your melee weapon swings.
---------- Post added 2013-05-14 at 12:01 AM ----------
Heroic? Pssshh Can almost do that in LFR gear level! With some luck. With BiS LFR, I think reaching 70% reliably should be rather easy. Seeing as I was reaching above that in far from optimal gear, hey, shitty drops, no sockets, no haste, what to do? :/ And far from expertise cap
At full heroic gear levels, 80-85% should not be impossible with a bit lucky procs. Just some simple maths put 74% reachable with DivPurp at 40% haste without even accounting for GC procs from avoidance and bloodlust. Add GC procs and you have about 77%, add the bloodlust and hey, above 80%. However the Mistress of RNG would probably make that 75-85%.
At 50% haste it is about 79% uptime before bl and avoidance GC.
Now just random thinking here I know, but pvp 4p, and voila, 100% uptime