I assume you are using a paradox style bullet sized to .729. The crimp makes a bigger difference than the wad pressure (I use 100lbs) How are you crimping the brass cases? Why not use a paper case? Being able to size your bullet from barely engaging the rifling to larger in increments of .001 would be a plus or maybe a teflon wrap to increase size. I would have gone with about 19 grains unique with a short column ring crimp and partial closure in a paper case with the .729 bullet for a first load but I cannot recommend this load to any others.