No sense even worrying about it until you get the string from Big Jim...twist the one you have now so that it gives you more like an 8 inch brace height...you are not really worried about how well it shoots at this point as you are going to be replacing it...and do not worry much about arrow spine or flight...it will most certainly change with the better string...so do you have someone working with you on your form...tuning without solid form is just an exercise in frustration...I have been shooting for 5 years now, I have tuned a bunch of bows, and some days I just give up on trying to tune something new because my form is off a bit
DDave