Thats not an easy question to answer. You're at the pinnacle of haste on that character. You hit stuff really fast without a lot of "Mmph!" in other words. Still topping meters, because plain and simple - you're a S2M Spriest. But look at it this way, start looking for gear thats flip flopped from what you're currently doing. High Crit, Low Haste. More Crit = more damage, more auspicious spirits which generate 4 insanity per spirit and they dont cost you any GCD. You may not reach the time you're looking for - but you'lll do more damage. Above 10k Haste, crit actually weighs .33 more than haste if math makes it sound better. Wish I could help you more, but dont get distracted by trying to reach max timer.
Trinkets is easy from that selection, if they're all equal'ish item level. Crono Shard would put you into such a high haste that it would be wasted in most situations. Oakhearts gnarled root has been parsed out and is trash. The Versatility has a weight of less than 1, to boot. Twisting Wind has been parsed out and although it doesnt have any secondary stats - its still higher damage returns than the other two you listed. Ranked BiS next to your Arcano in most guides.
Sorry Im not more help in answering your specific question, but hopefully the response steers you in a better direction.If you're still adament about your direction - try Power infusion at 70, use a GCD, then use your Mind Bender - that instant cast builder should net you the push you want.
-Edit- Most of the stuff I said is based off information you can gather from H2P, AskmrRobot Forums etc. I just summed it up to you so Im not speaking out of my ass for example. I geared myself towards a more rounded approach so Im still desirable in high Mythic dungeons. Sticking to 8k Haste minimum and stacking Crit. 12k Haste is very raid specific and only for a few bosses.