Hey cool team you have here. UU is a cool tier, I should play it more

Anyway, I would really watch out for Chandelure and other ghost types. The main problem here is that they can switch in on anticipated HJK's and explosions for free, and then letting you OHKO yourself with your +2 Mienshao HJK fail :/ Also watch out for protect users when you've set up your Mienshao.
I really am careful with HJK'ing when noticed a Ghost, so that isn't much of a problem. Stone Edge also kills the chandelier on the switch-in.
Scarf Chandelure OHKO's Azelf and doesn't mind being tricked (t-wave cripples it though), can clean up a weakened Weavile easily, and beats both your guards with shadow ball. Snorlax's a good counter, but he has no coverage moves, so can't actually hit Chandelure & co, but can only phase them out. Just make sure Snorlax stays alive as long as possible, which is also a hard task with the many fighting types in UU.
Snorlax indeed is stopped dead by Ghosts, but Froslass and Chandelure will eventually kill themselves by switching into SR multiple times. Pursuit is a useful option though.
So, I think you could maybe change HJK on Mienshao to Drain Punch or even Low kick. This does trade in a lot of power, but makes it easier to actually sweep after a SD or two.
I'll try out Drain Punch, see how it works out.
a scouting scarf Flygon is dangerous too, u-turning away from everything and even being able to sweep with Suicune gone.
Another true statement. Maybe changing Weavile's set to a LO set will wirk, with Ice Shard > SD?
Having two resttalk sets seems a bit weird to me too. I would consider making the snorlax set either a choice band set with Return, Pursuit (has the benefit of easily disposing of any ghosts bar maybe Cofagrigus), Earthquake and Fire Punch/Crunch, or a chestorest set with the same moves, but rest in the last slot, for when you still want some recovery (Snorlax should really get slack off

)
Yeah, 2 ResTalkers is a bit redundant, but they are so good in walling, and it causes many ragequits ;D And Snorlax/Suicune are both really bulky on the respective defenses, so I prefer them to stay as defensive as they are.
Hope this helps and good luck with the team!