Tadpole,
I have 2 Silvertip recurves, both with FF strings. Based on my experience, and on advice from Dave, for a 30" arrow you are probably going to need an arrow shaft that spines at least 90-94# (with a 125-gr head) if you have the FF option. Dave's bows are cut past center (3/16" if I remember correctly) and take a much heavier spine (by 15-20#) than what the general equation for length past 28" and a FF string would suggest (5# increase for each). The only experience that I have with aluminums are 2219, 2315 and 2317. I would say a 2219 shaft will be what you'll need; 2315s would probably be OK too, but I prefer the narrower and heavier 2219.
Hope this helps.