With your setup, your front should not unload like you are saying. Most likely you are grabbing too much throttle too soon, however you can try a thicker center diff oil. As for bearings, I prefer Boca Green Seals, but as of late have been buying any cheap $1 bearings because I just toss the old and throw in the new. As far as the triple goes, are others clearing it? What engine and clutch setup are you using? Are you using the right tires? What is your front/rear ride height?