Dutch, buddy, can you tell me your cgminer Utility? Preferably a list of values for each miner.
Perhaps the best thing you can do is use an older (unaware of merged-mining and not dropping all work on LPs) release of cgminer or find yourself a pool not doing merged mining.
An quicker and easier test would be to simply disable LP. It'll cause a 2% or so increase in stales but it will provide a big boost to efficiency.