Scuff (No Swearing Please) or no scuff (No Swearing Please). Is that really the issue at hand?
I have bats with scuff sheets, I have bats without, I hit fours and sixes with both styles, I get out with both styles.
When I get caught on the boundary do I think "why did I use the bat with the scuff sheet" no I think why did I play that shot with a fielder there.
When I hit a cover drive and it stops 4inch short do I again blame the cuff sheet? No I think I didn't time that well.
If there is a difference it's negligible, and doubtful that it effects the outcome of your shot/play/game.
So it seems to come down to the same old adage. " a bad workman blames his tools"
So my advice is, rather than mull over weather to fit or remove a scuff sheet, or once again buy a new bat, instead get yourself down to some nets and maybe buy some coaching sessions to improve your game.