RE: what could i pull back
How much let-off is on the compound? Say it's just 50% let-off--you are holding 27.5# at full draw--big difference between that and holding 40# at full draw.
Nobody can tell you what you will be comfortable with--you just have to be honest with yourself. I can say you will improve faster, be able to shoot more, and enjoy it more learning with a bow you are comfortably in control of. If I had to guess, I'd say 30-40# max at your draw length--probably 30-35.
Chad