It wasnt the conning tower. Thats in the right spot visually althought the screenshot is a bit skewed due to angle I took it in.
The mount point in the NSS_Balao.dat file was really off.
For those folks that want to know ...
Node - slot_M02_NSS_Balao
Move the Z parameter back or forth till you like the spot.
I moved both my guns a bit.
In addition I added two real crewmember spots to the UPC and set them as human not AI, so the gun is staffed when battlestations are called.
Looks good, works well, bring on the destroyers.