Sounds like a good idea.
If, perchance, the tires do not seem to be the deciding factor, you might want to look at the gearing........perhaps a fresh motor would help............and then there's the chassis itself - has it been straightened? Are you using two thrust washers at every axle/bearing interface? Perhaps there's a little wobble in the front end...........? Could the pod be a little less tight? It never ends, Alwyn, you know that................ You have to ship it to stop the inclination to improve performance........ ;) :o :lol:
If it runs like your Group 5 car this year, then you'll have nothing to be concerned about.
Good luck! :handgestures-thumbup:
Allan