I'm not sold on the whole tight fit idea. In my mind if all the pieces are tight then there is side pressure being exerted and I'm not convinced that won't potentially cause a problem, especially for the shafts. I like a case that has separate compartments for each piece so they are not clanging together, but a slight bit of wiggle room for each piece within its own compartment doesn't bother me as long as the pieces stand essentially straight up when the case is upright. At least I'm comfortable there is no sideways pressure being exerted on any of the pieces.
I'm no expert on case or cue making, wood warpage or anything. Just my thoughts, I don't like the idea of sideways pressure on my cue parts.
As long as the pressure is equal and not really tight I doubt it is a problem