Hopefully that resolves itself as the round count increases.
I've read of tuning M2's for softer loads by cutting off a few coils on the recoil spring. I think TNA has them on hand if you go too far so might be an option for you.
I went over some of the bearing surfaces with emery cloth. I've also ordered some faster slugs.
I really don't mind tinkering with it - I actually quite enjoy it.
I've got plenty of other auto shotguns to fall back on.