I've always wondered why other manufacturers don't have lower rails - it seems like a clear playing advantage to me. Is there some disadvantage to lower rails (other than making "standard" rails more difficult for you because you're not used to them)?
pj
chgo
I am currently in the process of replacing my 1 3/4" rails with 1 5/8" rails, for the reason that you describe. I will let you know if it actually makes a difference.
I believe that Real King Cobra has mentioned that 1 5/8 is as low as you can go with the k-66 profile. Any lower, and the ball will not rebound correctly. An exception is the Accufast cushion, which was designed with the intent of using a 1 1/2" rail core, but I don't think it is really a k-66 profile.
A thinner rail core will have lower mass. Does this make a difference? I don't really know. I have milled rails out of pine and poplar, and while I do detect a difference in the sound made, I can't say that the higher mass poplar actually plays any better, although certainly it is less likely to warp. If rail mass, as opposed to the solidness of it's attachment were a key factor, then I suppose highly dense synthetic materials like MDF would be preferable, a concept that would send pool table purists into a state of psychosis.
Number 6 on my list of things to this winter is to experiment with a flat-beveled cue tip for shooting off rails (wedge shaped). With a dime radius, the cue tip will strike the cue ball a few mm above the cushion, a situation that exists regardless of rail thickness. With a wedge, you could, in theory, impact the CB where it meets the cushion nose.
Finally, I believe some old-school shooters push down firmly with their bridge hand to compress the cushion to get a lower hit on the CB. I've tried this, but couldn't get it to work for me.