When ordering a ball for any of my customers I always tell my distributor that I want 3"-4" pins. Since I have a 5+" span I try to get 4+" Pin/CG's for myself. This will allow good flexibility in layouts. Your stats are in the same ball park as mine so based on that and your layouts on the Raptor & Sigmas my recommendations is a 60x4x40 with a +/- 5 on the angles. From what I've seen on the Backdrafts I've drilled for people of various styles I think it would fit in to what you are looking for. Always best to have you pro shop guy watch you throw & make the necessary tweaks to coverstock and/or weight hole.
Hope this helps & stay Motiv-ated !!
ps: Spent 18+ yrs. in Houston so I've been to Seabrook many times.