starter flywheel issues please help

I just had harmonic balancer, flywheel, rear main seal and starter replaced. I had a starter stick and break a bunch of teeth off the flywheel.   Now my new starter just started grinding, the starter has only been on the car about 6 weeks.  What am i missing? And the car is hard to start when hot, turns over much slower then normal. It usually takes 2 to 3 attempts to get it running.   Recent tune by me and timing set by shop who replaced balancer.   Any help is appreciated, about to give up on 5.0.   Anthony thanks   1993 gt conv, 156,000 miles