I looked at that model ( For P-20 power) as well. I settled on a Swift as I hate the fat rear fuselage on the Stingray. I think a Lambert would be working hard to fly that around how you would expect it. I doubt you would ever overspeed that one though.
Easiest option Darren is to get another P-20.. Far more scope on airframes then. I have just had another batch of five arrive, and can offer you a trade in on you lambert if you wanted? ( I have a need to put a lambert on a nice display stand, along with a new JPX that I have here.... Damn I am slowly turning into my dad )
Regards Al