I suspect the differences you guys are seeing has little to do with the bed cloth, but more to do with dirty, sticky rail cloth. The stickier the contact point, the faster the rebound will be. Have you ever messed around and shot a few balls on a table with no cloth on the cushions? The balls roll around like a pinball machine. There is very little lose of energy from balls scooting off the rails, it's almost like perpetual motion, the same principle applies to dirty/sticky rail cloth at the ball contact point, but obviously not nearly with the grip of phenolic resin meeting good ole bare gum rubber.Yep. I first noticed it when I started alternating tables too - one place I'd been damp wiping for almost a year, the other place hardly ever. The hardly ever place felt slicker even when I was wiping it... now, after a couple months of wiping both they're both slower.
pj
chgo
Edit: If you guys want the little bit of extra speed, but you like a somewhat clean table to play on, then clean as usual and leave the rail cloth contact points dirty and sticky.