If you are having problems with your miner, you should probably get those resolved first before complaining about what slush is doing. Seriously, when my miners are stable, which is almost all the time, my payouts are constant and regular. I've never had to worry about the score normalizing.
I'm not one that is complaining... Read posts... I just told my experiences... And I'm resolving it right now. Idiot employee drooped it because he felled the need to move it...