Position size has to do with what the market is telling me. It has to do with time of day (liquidity), what the technical position of the market is(hanging off a cliff, in balance, or something in between), whether it's near big round numbers, if it's reacting to news or just technically driven, and especially is there a reversal here where someone has been trapped. I really don't see how one can have the same position size all the time. If I see a market that has been spooked somehow, I'm going to press automatically. Otherwise I tend to be cautious.