Chainslap Problem

I recently built up a cove stiffee but I'm having a terrible problem with chainslap. I'm using a hone crankset with 2 chainrings and a bashguard.and lx derailers. I measured the chain length by putting around the largest chainring and sprocket and adding one link. It's a sram powerlink chain. Whenever I am on technical tracks or going downhill, the chain is bouncing all over the place no matter what gear combination I am in.
Should I just take another couple of links out of the chain or would that make it too short?
Should I just take another couple of links out of the chain or would that make it too short?
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