if you're 411 lbs and your target weight is 220 then you are carrying an extra 191 lbs. on your ride. I consider myself a pretty strong cyclist. If I rode my 11 mile commute in tomorrow with an extra 191 lbs. on my bike and was able to average anything near 10 mph I'd be thrilled. I think I'm Hercules when I ride the 1 mile back from the grocery store with 40-50 lbs of groceries on the bike.

You are one strong, determined bike rider. Hang in there and don't wear yourself out. Make sure you're getting lots of rest and water.