Issue with GWX3 depth (no not because of speed)

Hey guys, as you have seen from a few of my other post I have recently gone back to SH3GWX3. I'm noticing a huge issue with the depth orders, atleast for the type 2a. One, the sub doesn't submerge with a periscope depth order, it chills out at 9ms, well high enough for your tower to be seen. Two, upon giving specific orders for a certain depth, it always runs shallow, an order for 15m nets me 13 1/2m. It get worse the deeper I try. At an order of 60m I can't seem to pass 35m. Even with the huge slide out tool, it doesn't work. It's really bumming me out.

Also, while I have your attention, is there any way to mod crew compartments? I've always found it dumb to have three officers on duty in control, but only two bunks for them to sleep in. Would like to remove two normal crew slots and replace them with one officer slot in the bow. Any way to do this without being Gabe Newell?