I have a Dewalt RO sander, it's a single speed one I picked years ago, it works but when I sand my end grain cutting boards its a hell of a fight to get some scratches out, even only going from 80 to 120

I Have to hold it sideways and let the edge work to get it out.

I would like something I can hold flat and will do the work for me

I would like to stay with 5inch if possible becuase i have a lot paper for the 5inch 8 hole already