The miner is now so stable and solid, I doubt there is much more that can be done to improve it.  That being the case, he should probably increase the fee to say 2.5% as the software is well and truly out of beta.  I get hashrates at least 4% better than the nearest competitor so I would accept a higher fee.  Can't say I would like it but I wouldn't complain about it as I am a firm supporter of capitalism and fees should be set as high as the market will bear.  Can't see any reason why he should lower the fee!  Doesn't make any sense at all to do so.