RE: how long to racks grow?
They may or may not get any more points but it is very likley that they will. Basically they will continue to grow just as they have been so far, adding mass and points as they go and their antler length permits. They still got 2 - 3 months to go depending on where you are. The mulies out here don't shed their velver until mid to late September.
I suspect that most of the six's will be nice eight points and most of the eights will become nice tens or better.