Love me some TA... haven't played it with Symphony yet, but I've got 10 different TA toons, most of which are 50. So I can comment on slotting there (there's also a decent TA guide by @KaizenSoze
Anyway, here are my own thoughts on Trick Arrow.
First of all, I like to build for recharge on TA (and some defense to stack with Flash Arrow), so take note when I give certain set suggestions.
Entangling Arrow - if you've got slots to spare, 5 slot it with the Immobilize purple set. Put the Chance to Hold proc in there instead of the Immobilize/Recharge IO. If you don't have the slots to spare, a single Accuracy will suffice.
Flash Arrow - I like 4 slots of Cloud Senses for the recharge bonus. you'll want to ED out the to-hit debuff as half of it is unresistable, it works the same as armor basically.
Glue Arrow - meh... I like it, but usually only single slot it with a recharge or a Range/Slow IO if I have enough global recharge.
Ice Arrow - People will tell you to proc it out. You can, if going for a strong damage build, I personally like to put 4 Basilisk's Gaze and 2 Lockdown (including the +2 mag hold proc) or 6 Lockdown for the armor.
Poison Gas Arrow - If you've got the slots to spare and haven't slotted the sleep purple set in your Symphony sleep, 5 slot it here, otherwise 1-2 recharge is good.
Acid Arrow - Ideal world you want at least 2 Accuracy IOs and both -res IOs (Achilles' Heel and Annihilation) Maybe even 2 Defense Debuffs as well to let you hit through tough targets. But I usually end up with just 1 accuracy and the Achilles' Heel proc.
Disruption Arrow - a single end redux if building for recharge, a single recharge if not.
Oil Slick Arrow - I like 5 Ragnaroks (skipping the knockdown proc)
EMP Arrow - again, depending on how I'm building either 4 Basilisk's Gaze 2 lockdown or 6 lockdown.
The worst thing about TA is that every power is good enough that you don't want to skip anything.