Well gunman, welcome to the fold, what ever you don't like about an AR15, can be fixed. A mini however is a lot harder to correct. The AR15 platform has many advantages, everyone makes something for it, grips. sights, triggers or trigger kits, Barrels, sighting systems, free float barrel kits, adjustable stocks, flash hiders or muzzle brakes, even caliber upgrades. You've already played with some of the features with good results. Good luck with your projects.
Don, a single rifle does not a rifleman make, it must be able to deliver at 300 yrds, +. the .357 magnum is a good cartidge, but won't deliver at this or greater distance.