Wiggs doesnt need a nerf, strong mod speed is what makes Wiggs powerful. On my server if you cant at least hit 235 (low end) speed with Wedge unique, might as well not use them.
My thoughts on Chaze... The counter really helps heal those 2 up and you cant focus them without a means of either blocking the heal, or a OSK. The auto-taunt when Chirrut drops below 100% is a tad aggressive I think when you consider RG doesnt kick-in until 50%. You really better be able to take Chirrut from 100% to dead or he just heals back up, or but a debuff on him. The high % counter with <100% auto-taunt is the only issue I see, but it can be dealt with.
Chaze combo is very strong and youre not gonna be able to face roll them with Wiggs. Characters that have Daze, Buff Immune, Heal Immune, Shock, and Buff Removal are needed here. If you can keep Chaze from healing so much, then its over. Sure Chirrut can cleanse anf buff Tenacity but it's easy enough to remove.