RE: greasing sabots and accuracy?
Greasing your sabots will indeed prove to be counter-productive. The plastic is as slick as it needs to be already......adding lube will only gunk up the bore as each round is shot. The plastic itself leaves some residue in the bore when fired, and when you mix a lube & powder residue with it - you have a recipe for a mucked up barrel.
You're best bet is to just make sure you have a reasonably clean barrel before loading each round. A good bullet starter will help - as will a screw-on T-handle for your ramrod.......both will give you more leverage and ease loading.
"Every moving thing that liveth, I give unto you as meat" (Gen 9:3)
Trust God..........but keep your powder dry!