I had a rigid kona unit ss and had fun on it, but never raced it. Trails where I live are not bad fully rigid, but I would lose a bit of speed on the downhills. Now have a spec stumpy ht (older 2nd hand sworks 29). It's light already, but fork seems to be leaking from neg air a bit and toying with the idea of sticking a rigid carbon fork on it, a chisel probably. That would make it silly light, shaving roughly two pounds off the front. Think it would be worth the loss of downhill speed or end up a wash? Anyone with experience racing rigid vs front suspension?