Please reduce the size of your pictures.
"...was hoping for tighter groups..." Try another powder. Been using IMR4350 with 90 and 105 grain bullets with a low end(glass bedded, Win70A stocked, Cooey M71 with a stock barrel), 1 in 9.125, barrel for eons. Gives me consistent minute of deer accuracy with either bullet. No point in trying match bullets out of my rifle. Its barrel is not up to them.
Have you done a trigger job and bedded the rifle? An SPS is a hunting rifle, but they do improve somewhat with a trigger job and good bedding. A match rifle they ain't though.
Mind you, match grade bullets out of a hunting barrel will make a difference too. Your rifle will be fine, but you likely won't get one hole groups with a hunting barrel. They'll be better than a hunting bullet though.
Your 42.8 load is the one to use. Or you can work up by 1/10ths from 42.7 to 42.8.
43.0 grains is a full grain over max for a 95 grain bullet.
"...checked bullet stability using JBM calculator..." You're putting far too much faith in a computer program.