Also the step height has been contrversal with the SB disks. There not the same thickness as your average dsm disk.

I drive my 2600 with a 6 puck daily... I don't find it that bad.. Try the 2900 it feels lighter.

But agree with Bryan.. Maybe your leaking something onto the disk

11.45@125,
stock bottom end 6bolt 2g head.
272 hks cams.
Holset hx35
Backyard biult!!