#1
I am currently learning Smile In Your Sleep by Silverstein, because it has a nice impressive intro, fun tapping stuff. I can kind of do it, but only on my little bro's MIM Strat. I am wondering why. The Rhythm guitarist for Silverstein, Josh Bradford, uses a Gibson SG for this and so I am wondering if there is a certain element, I dunno what word to use, of a guitar's build that makes it easier to tap on.

Schecter Gryphon
Mahogany Body
Maple Neck
Rosewood Fretboard
25.5" Neck
24 frets

MIM Strat
Alder Body
Maple Neck
Maple Fretboard
25.5" Neck
21 Frets

Gibson SG
Mahogany Body
Mahogany Neck
Rosewood Fretboard
24 3/4" Neck
22 Frets

It wouldn't make sense for the body wood to change affect it, maybe the neck, but the necks on the Gryphon and MIM are different than an SG, I thought it might be the fretboards, but when I saw the SG had a rosewood fretboard that killed it.. Right now I am thinking that it is simply because of the number of frets. Cause more room to tap on a 22 fret 25.5" neck than a 24 fret 25.5" neck. Right? Does this make sense to anyone?

I don't tap often, but I figure it is a good skill to learn in case I want to use it. So if some one who is smarter than me could answer this I would greatly appreciate it.
Gear:1991 Fender MIJ Jazz/Squier VM Fretless Jazz -> Pitchblack -> Way Huge Green Rhino -> Boss OC-2 -> Boss DD-7 -> Markbass Tube 800 -> SWR 4x12.

Flat wounds. Flat wounds on everything. Everything is a little fatter when it's flatter.
#2
It's all in the fingers. Different woods would have different tonal effects on a tap. Hows the relief on your neck? How lows your action? Fret buzz issues? Those are about the only thing I can think of that would affect your abilty to tap on a certain guitar.
If you start a reply with: I have never played one but I have heard good things about it! Your opinion is invalid.
#3
My fingers are fine, I use approximately the same technique for both guitars, how hard I tap, how precise etc., my action is a little lower than the strat, and there are no fret buzz issues.

EDIT: I know my technique needs a little work, but I am certain it is not the main problem right now.
Gear:1991 Fender MIJ Jazz/Squier VM Fretless Jazz -> Pitchblack -> Way Huge Green Rhino -> Boss OC-2 -> Boss DD-7 -> Markbass Tube 800 -> SWR 4x12.

Flat wounds. Flat wounds on everything. Everything is a little fatter when it's flatter.