Ah, hybrid route with strong traps. Good way to go. For kicks, I'd aim for getting just enough points for 3 kicks (lvl 12) or 4 kicks (lvl 18).
The weapon switch you say can be expensive. Yes, it can cost a lot if you go all-out or if you forget which one you are on. Otherwise, it's pretty cheap. For a long time I used a Black Flail with Stormshield on one side, then dual Spirits on the other. Crystal Swords look a lot different from Flails, so no problem there. The only thing that has changed is I randomly found an Asteron's Iron Ward (decent damage, slow, 33 CB, and magic damage - the AR bonus helps too).
On your traps, the only thing you can affect is how fast the drop on the ground - and that is IAS not FCR. The breakpoints are in jrichard's speed sticky, but I can tell you off the top of my head that your speed will be fine if you use that black flail + BoS. An IAS jewel in the Guillaume's isn't a bad idea, though.
Stormshield is hands-down the best shield on a kicker. On your build, it's good - and is only missing +skills. That's why I use a switch.
I honestly have no idea about the DR% thing. My solution has always been to avoid the high damage poison clouds. There are two basic ways to handle that - 1 run past and 2 - kill everything.
To run past, queue Mind Blast (you'll want a little more fcr to do this), use BoS, and run just knocking everything out of the way. Dragon Flight straight to Nithy and kill him on the spot - drop DSies to clear the room, or just pick the loot and teleport out.
The other option (kill everything) means playing a more defensive approach. I would let my merc die, use my Shadow (slvl 17+) as a distraction, and Blade Fury them with the Black Flail. That works really well in 1-player games, though you might need more firepower in higher player counts.