Cave doesn't need to be changed, there's nothing wrong with it, I like how it plays out as it gives a very good alternative to pushing mid and 2nd.
So far on middle this is the best change atm, however, again it's going to be mega difficult to push with all these stupid sniper sight lines, not only that but as I mentioned in my stream defenders can gain way to much intel and spam time on the enemy before they can even start to get close.
I'll say this for like the 89th time, you are changing way to much just because a few people whine about how difficult x is in the map, people that are complaining that shutter on last is hard to push? The same thing partially applies to gullywash shutter and badlands last.
Main thing is this map is being changed so much that there isn't time for metas to really settle on the smaller sections of the map.
To me the only thing that needed fixing was middle, some sightlines and a few tweaks at last, but you seem to change loads of stuff just to please everyone.