So I did as popcorp suggested and built a pre-b10, had it doublemixed.
I built a new mid and made a few changes to last and everything was well liked other than a few small issues which I will be fixing and then putting out as b10.
Current changes:
Block bullets clipping @ 2nd floating stickies
Displacement hole 2nd choke
Reduced last capture time from 2.0 to 1.3
Made the capture area a cylinder to reduce wari's autism attacks
Added a prop at last to allow scout jumping
Moved kit+ammo at last
Made secret/sneaky less chokey
Lowered the railings in lobby so that they are flush
Fixed sightline from mid-forwards at 2nd
Moved forwards at 2nd to a more logical place
Moved small kit on top of the spire
Changed a few medium ammo packs to small ammo packs
Re-designed mid
Made upper left at last a shutter
Osiris, part of the reason that is like that is to deal with the sniper sightline from the roof to 2nd. I can clip that to be a flat wall and the same ends is met without a visual change, and it shouldn't mess with collisions too bad.
Here's a screen of the new mid: