It's not a direct comparison, but it might help a little : my BT Reg'd 0.177 cal AA400 Carbine runnng at 11.4ftlbs with H+N Field and Target Trophy Pellets gave me 65 good shots before falling off the reg.
With one of my other unregulated AA400s, I found that slight downward adjustment of the power setting gives a reasonable increase in shot count, from memory, maybe twenty further good shots for a ME reduced by 0.25ftlbs or so.
Possibly jugging around a few of the settings might help a little, and checking for leaks in the Transfer Port and Barrel Seal area might show up something causing detrimental performance.
HTH, Vic Thompson.