I moved on from my thunder tiger 40 trainer after about a year. I could do most of the average areobatics and it was the 'treeing' of the trainer that forced me to move on. I aquired a secondhand Mick Reeves Gangster 40, put the same enging from the trainer in it, set up with a forward cg and small / large throws on the rates. I found no problem flying this andf have since 'hotted it up' by moving cg ect.
Tom.