Best defensive gem setups for ranged/bow characters...

more or less, yeah, just check out the gem description. It's got several effects, and the lowered enemy detection is the main part that's very useful with cwdt (and the movespeed is nice for repositioning in that lowered-detection window). Just keep in mind it'll eat your frenzy charges when it procs if you've got any.

it's easy enough to see how effective the reduced enemy detection is in practice, just equip the setup and go somewhere where there's big swarms of enemies, like the act 8 pre-town area (sarn ramparts?). Just the bugs or w/e surround you and wail on you til cwdt-phase run procs, and then just run around and see how few of those enemies actually continue to follow you... only a few will, while the rest will stand around until phase run's duration runs out (or you break it by using a skill).



as for frost wall, yes, you can phase through it (just tested it to be sure), so you could combine the two to potentially get a contingency against unfortunate walls while also taking advantage of the aggro drop from phase run. Keep in mind though that if you manually use any skill, the phase run will break and you'll lose that ability to go through them.