Gonna go over some more technical issues with the map so that you have somewhere to start working
minor displacement bug
http://i.imgur.com/ungNsrN.jpg
a lot of clipping stuff i'd like to see changed
one that someone mentioned upthread and probably the most egregious example, this messes people up constantly and you could probably just shorten how much the roof hangs over in addition to adding some clipping
http://i.imgur.com/2vzv9sK.jpg
no clipping here
http://i.imgur.com/ZnRfmQi.jpg
no clipping here
http://i.imgur.com/3QeqVMV.jpg
no clipping here
http://i.imgur.com/inK3bS6.jpg
no clipping here (sorry for bad pic, this is inside lobby)
http://i.imgur.com/zKvF7fO.jpg
no clipping here
http://i.imgur.com/ZovGnJT.jpg
no clipping here (easy to get stuck between that door frame and the support beams)
http://i.imgur.com/RNBv8MZ.jpg
no clipping here
http://i.imgur.com/SHdSbya.jpg
last clipping issue, although personally i think you should just get rid of this spot altogether, it really makes no sense
http://i.imgur.com/xFNAIU7.jpg
more awkward/underutilized/impeding geometry
this spot at mid catches my head constantly, because the platform sticks out past the wall next to it, i would fill this in or move the stairs back a bit so that you cant accidentally get stuck under it when you're running past it.
http://i.imgur.com/FsSbxEU.jpg
the pinch at this spot really doesnt make much sense, i'm not sure if its even something that needs to be fixed but it's very awkward
http://i.imgur.com/lNhbBV1.jpg
as far as overall balance changes go w/r/t last stalemates, i think that tends to happen because there are really no viable ways to push in and rotating is slow because of the width of last. shutter is a super choke and easily trapped, and lower means you're giving up any and all positional advantage, which means that pushing the main door is the only viable route, and is defended the most heavily. rotating to shutter is really telegraphed every time because everyone just disappears from the doorway, and rotating to lower takes ages because you have to rotate to shutter then go down the ramp then clear a narrow doorway to be out lower. maybe shrinking how wide last is could help attackers get in more easily, because rotating would be less predictable, and maybe removing the shutter and adding some clutter in front of spawn to prevent a sightline would help pushes from that side be more effective. the rest of the map are some of the most interesting and unique 5cp areas and i would shy away from messing with them too much if at all