Grabby refers to brakes not traction.
If your tire's tread is causing traction issues,nothing you do with the brakes will fix that. You need to run different tires. I always advise the folks who come to my clinic with cross and MTB's to switch to street tires if they're not going off-road or riding in snow.
C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport/Qualifier,Dahon Speed Pro TT,Brompton S6L
Yes. Wheel can get Tacoed but braking power isn't affected.
"Cycling is for pleasure not penance"
Disc brakes are far superior in wet conditions. I just made it through my first wet coast winter with discs and they have required very little maintenance. I hose everything off usually once a week.