Increasing YG further to as high as LV83 : For justifying this based on his fight against GWM, I would once again attribute it to GWM unperformance. Remember that ZBT is only at LV77 so YG at 83 is really too high. Also, GJ supporters would riot.
Post 16 HIS YG is not rated as he never fought using it.
RWX at LV65 is not impossible, but I feel it would reduce the overall skill level of SPW quite a bit. Also, This would also reduce FZ accordingly, and I always place FZ at Great level (i.e full mastery of YJJ)