This is what I would personally do:
Block off one entrance to B and open up one that goes on the side. CTs could basically just stay site and be able to hold both places at the same time. Some of the positions on site seemed to strong fro exactly that. Eliminating the fact that Ts could only come from one side of the site, and opening one on the other side should help balancing B site (with complementing changes to cover, boxes, etc.) You could also possibly create a dropdown from the stairs into aps, and down to the swers if you think it's needed.
The idea behing the aps seem like it was just a quick fix for rotates on Tside. I think adding rotational routes through already existing areas would make it better. Opening a passage in lower sewers to CTstairs would add a bit of risk/reward situation.
Now for the A site, I believe this is the most crucial one. There's way too much vertical gameplay going on as you're on site. CTs could literally be anywhere above you, except behind. Blocking off th upper section as shown in the picture would add some balance to th entry fraggers as they wont have to spinbot out of their area of entering.
These are just some suggestions ofc. You can do whatever you want, it's your map after all. I just think it would balance the map as it seems very CT sided right now.