cant fault the toyo t1r's (195/50/15) on my eg civic even in the rain. very grippy, with the lsd and the tyres it very rairly wheelspins even on high rpm take off in the dry after theres some heat in them(high comp b18c-r)
could also be the pcv system not working properly there is a kit from america which replaces the black box at the back of the engine with a catch can/swirl pot arrangement supposed to be gd for high reving honda engines.
dont think they'll go down any more than what there at already as said they will probably go up the more people smash/break them etc its sad to say but normally true.