Really? I'm unsure on the multi-grip level tracks i run on, carpet and super slippy wood or rubber gym floors. A gear diff set for carpet won't work on the slippy, and set for slippy diffs out on carpet. I guess it's worth trying, only ~£40?

My son has the gear diff in his yokomo and at silverstone on the slippy vinyl he had plenty off grip both in side bite and traction so long as he wasn't to crazy with the trigger (he's only 6 and having a 5.5 in was probably a bit much lol). I've got 5k in the diff and he had plenty of steering on the astro and the traction was good to. Definately worth a try IMO