+1 on AustralianMagic's idea to replace 85 with Double '74 call-in.
Either that or I suppose adding an "Upgun" upgrade to 74 that allows you to upgrade to 85 for a Muni and/or Fuel cost would suffice as well. For balance reasons it might be better to just upgrade the gun and not add extra HP so that the stock -85 commanders remain special.
