Howdy Bob, your load sounds fine to me, might need to add a little shot. Have you ever patterned your shotgun with this load?? Some loads blow a hole in the middle of the pattern like a dougnut, more shot is one way to fix this. I have a light 7/8oz load for Heather, 47gr ffg with Federal 12SO wad that has handled any KD or clay popper so far. My 1 1/8oz load is 57gr ffg with Rem SP wad with great results. I like using plastic wads, they're quick, easy to load, throw a great pattern. Of course I haven't shot any with chains for a reset rope either. I know I shoot less than a square load but it works for me. Hang up an old sheet or a piece of butcher paper to see how your load patterns, it could just be the KD. Hope this helps.
Jefro, Relax-Enjoy