Hey Pieman, I can only assume you'll be coming to speak to Simple Simon
If you still have a mini you can certainly bring it tomorrow and race, but they are well off the pace of the GT12s. You can't go far wrong with a SS, they are now much more popular than Mardaves at the club. But Mardave cars can still keep up, I still run one.
I think the best move would be SS, with diff, on the right tyres, with 2S shorty LiPo and 21.5T. But you'll see what's what tomorrow.