tkkr,
You can also get a 'smith' to place a steel insert in the feed ramp. Geo Smith of EGW and Chuck Rogers of Rogers Precision can do the work.
Rogers did one of mine. Colt had miscut the feed ramp angle. and it did not reliabily feed the top round from slide lock or slingshot.
Some JHPs do not play nice with aluminum feed ramps. The old Hydra Shock and the newer Ranger have, so far, worked well in my Commanders. The Ranger is a plus p round and I do have no knowledge about longetivity in aluminum frames.
If it eventually cracks a frame, I'll just get another Commander.
salty.