Cannot submerge - Manual dive planes?

[Anachronous]

Ok got myself into a situation. After an air attack, I nearly met my maker. The rear bulkhead was almost gone, the aft torpedo room was completely flooded and I was slowly sinking. The only thing keeping me alive was that I was ahead flank on batteries and had already blown ballast.

Eventually I got the sub repaired and the flooding under control, only to be stuck with my nose out of the water and taking a looooong time to get to surface. Only to find both my pumps were destroyed.

With both pumps destroyed I can still submerge(?) but I go down rear first unless running at full speed.

I need to submerge during the day because i'm close to Japanese air patrols and i'm out of AA ammo.

The problem is, while the rear planes are trying to bring the rear up, the front ones are doing the same. Is there a way to adjust them manually, so I can trim the front planes to level out my boat?