Here's how I do it:
-With the neg flooded, open the rear MBT until it reaches 5m^3 then close it. Blow down the rear MBT if needed so that the tank is at 5^3
-Blow out the neg until it is empty.
-Open the forward MBT and watch the gauge until it reaches 10m^3 then close it.
-Top off your air supply.
The end result should be 15m^3 in the forward MBT, 5m^3 in the rear MBT and 0 in the neg.
There is no effect to the boat's top speed or acceleration as long as the combined total of all tanks(MTBs/Trim/Neg) and bilge are under 27m^3
When a dive is called for, open the forward MBT, set the front dive plane full down, leave the rear at 0, then open the rear MBT. Return to the dive planes and arrest the dive by setting both dive planes to 0.
You'll sink like a rock and use 0 air in the process, but make sure your engines have kicked over to electric first though, otherwise you'll flood the engines.
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