Re:
I find the splashback (theones fitted) fine untill it gets very muddy, even then I can ride them, just abit slower.
You all must ride funny or have no rad skillz ;-)
Keep the tyres as they are new and not old original ones and a perfectly fine tyre. Run them at 30 to 35 PSI (ish depending on wait an if they are 1.8 or 2.1)
As for smokes, not my favourite tyre and didn't like the dart as it always washed out, could never get it to grip on corners.
I was a Pshyco person and IRC Geo Claw in the end.