I knew you all would have some great suggestions and advice! The foot I was using was a generic foot because I was FMQ'ing on my vintage 15-91. The foot was advertised as fitting a 15-91 and it was doing a great job until the needle hit the rim. It went all the way through the rim! I guess I will be more aggressive with trying to sand off the rough places and see if that will work. It can't make it any worse...
I usually never hesitate to take back a product that is defective, but I am not sure if it was the foot or me that didn't work right! Plus, I can't find the receipt, either!
Thanks, everyone - you all are the best!