As I mentioned earlier, check the wheels. Take the wheels off the bike and spin the wheels in your hands, make sure that the axle in in your hands and NOT the quick release. If the bearing adjustment is too tight, then the wheel will spin and feel as though it is catching in your hands.
Although you only have 225 miles on the bike, it still could have dirt/water inside the hubs making them not spin as freely. I know that you mentioned that your DH services the bike, perhaps a trip to your LBS is also in order. They should ahve the experience to check the entire bike over, and give you a pretty quick answer. I seriously doubt that the frame is out of alignment etc.... again check the wheels!
As for the Nevegals, they are indeed a bit heavier tire but they are meant for "traction." If you're riding in an area that you don't need that much grip, then change your tires. I typically ride the Kenda Small Block 8's early in the season when it's dry, but this time of year I"m riding the Nevegals for traction over the wet roots and leaves.
Good Luck!!



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