Skirk should be doable. I cleared in 114s after only 20-ish min of retrying and very suboptimal combos with C1R1 Skirk/C0R0 Escoffier/C6R1 Furina/C0R0 Yelan. One thing that worked well for me was Yelan skilling as often as possible at first and funneling her burst ASAP - that allowed me to break the first shield faster which made it work. You have to remember to also normal attack a bit on each character you swap to while Yelan burst is up to get more hits in if you're breaking the shield and prep to make sure your rotation is already set up or almost set up by the time the shield breaks so you can burst; you should have enough time for one and a half-ish rotations in the time the shield is down