If you are going to set them, set em high.
But setting them a little above the current price actually has a negatvie affect,
I look at it as pressure, like air or hydraulic system, weight on a tilting balance scale
when you put shares on the ask ( for sell) it tells people and the system (algorythm) think you want to sell, making a stock look less inviting, and driving a pps down
putting in buy orders put pressure on the price to go up, makes people think there is a high demand for a staokc and the algorythms, thus driving a price up