Adam, I fly a Grumania Eurofighter which is similar ish, with a Wren 70. It has good thrust for the weight, around 1:1 depending on fuel state, but it is the drag rise of the delta wing when pulling hard that really counts. When I pull the stick into the corner to do a skidding barrel roll the plane almost stops. I can do max rate turns at full up elevator, full throttle and it won't accelerate above a modest speed. It is that drag, rather than the weight, that you really need the thrust for.

Harry