To get the most fps outta the Emax, you would need a FFF or Flemish Fast Flyte string. i shoot a 'Boo' custom string which is Flemish [twist] Excel [matl] w/ served on whiskers and it only costs me 8-9 fps from FFF. That, a 425 gr arrow, and an STS is as quiet as it gets for Excals, imo. The diff between FFF and endless loop is 10-15 fps depending on brace height or who you talk to, lol.
Limbsavers cost more fps than they are worth sound wise, imho.
I also shot the BB, it's a nice bow, liked it best of the Parkers.