Dear OP, I have gone through the trouble of simming your character for some answers.
For the original question about going all Haste; I have simmed your character and have concluded that your current stat priority should be Agility > Haste > Mastery. I tried to post a link to the sim results, but I'm not allowed apparently.
For your question about talents, I have simmed the following list for you (I had a picture, but again, cannot link):
138140 DPS AS/PE
137915 DPS EM/PE
136680 DPS EoE/PE
136027 DPS AS/UF
135983 DPS EM/EB
135681 DPS AS/EB
135326 DPS EoE/EB
135079 DPS EoE/UF
135078 DPS EM/UF
The big thing about RPPM is that it scales with haste. As you obtain more RPPM trinkets, and especially the legendary meta gem, your best talents and your stat weights change. Since 5.2 EOE has not been an optimal talent for sustained dps, as Ancestral Swiftness was buffed. Unleashed Fury was nerfed also, and so your current talent choices of EoE/UF is no longer optimal. I suggest leaning towards the talents at the top of the meter I posted above. As you obtain more RPPM gear and your ilvl increases, the BiS talent combo EM/PE will start to win over the other choices. So also keep in mind to take the information I post with a grain of salt as it is all changing with your gear.