I am putting together my machine and I have the x axis rails and bearings installed. They are HIWIN LG series 20mm rails and blocks. The bearings that I bought have a p/n designation that says they have a "light preload". I have 2 on each side of the machine for a total of 4. When I move them back and fourth by hand there is a noticable amount of resistance. Not a ton but a decent amount. They run smooth but are just stiff. Will these wear in and be easier to move or should I have bought the non preload version? My machine will be moved by steppers and I am wondering if this will affect the machine in any way?