well i have had the same problem when i had a smooth rim but when i met the grinder trials changed for me. I GOT WAY BEETER!!!. so i advise grind it. matt
well one thing that helps me is get your ass over the back wheel and as you hop straighten your legs out. thats called boobming its when your hopping and you going forward slightly. give it ago. matt
if i was you there is no piont modifiing your gimp there rubbish stay with that for a bit then get a new bike. if youo want rims i would say go for try-all or echo which is around £35-£40 but to fit in your local bike shop would be about £20. matt