Depending on the level of the racer, very small RPM changes in key corners can make a big difference. Also, the angle of the chain affects the way the suspension works. Squat under acceleration among other things that are beyond me...My setup is the bent linkage style you speak of.
Also I did dig through the sprockets I have and the largest rear is a 49 so that'll be the set up -1/+1
currently has 15/47 which is -1/-1. Not sure what that set up would do. Be stock but spin a little quicker for acceleration I suppose?