ASL riser placement question

[Kopper1013]

So I just got two risers glued up and was sitting on the couch pondering my next step when it occurred I have no idea where the riser should go on an ASL sounds dumb let me explain:

So my riser design is 15" long with a 4.5" flat area on the palm grip side 2.25" either side of center if that makes sense. Now if I put the shelf 1"-1.25" above center that only leaves 3-3.5" grip, seems small.
 Should I be sliding the riser down towards the lower limb more so I can have the full 4.5? If so do I still leave the limbs how they are measured out, 64" ntn so 32" from bows actual center either direction?

Any help is greatly appreciated, I've never built an ASL and my hybrids always have the riser centered. Not sure if I'm over thinking this.

Thanks

[jsweka]

I build mine symmetrical, pick the top limb based on which one is a little weaker, and then cut the shelf 1 7/8" above center.

[monterey]

I do mine pretty much the same as jsweka.  

If your grip is slightly convex, slightly concave or flat, your pressure point of your grip is going to fall pretty much toward center of the riser.

[mikkekeswick]

Short answer is it doesn't really matter! Put it where you feel most comfortable.
The majority of glass bows are made with the riser centered. Mark out the handle about the center point and then cut your shelf where ever it feels right for you.

[Buemaker]

Just curious, what does ASL stand for?

[Kopper1013]

Thanks guys, for some reason I thought I needed to shorten a limb or slide the riser down but having never owened an ASL I had nothing to measure out or compare to.

Bue ASL=America Semi-Longbow