Still no-one over there tried the bog standard ASP.25?
As mentioned earlier by me, my two have been a revelation: reliable, powerful enough to combat with FX's etc and CHEEP! In our Gremlin combat, airframes are standardised and NO minipipes etc, only standard mufflers (which is a bit small). Get more power by using 30% fuel, and slightly de-compressing the engine it didn't blow up, even on an 85F day.
Worth a try!
Bill