If you want to race, just do it. You don't need to be a certain weight.

Ankling is an old theory on how to pedal. I wouldn't spend much energy trying to learn how to do it. You do need to make sure that you are not pushing down on the upstroke, opposing the leg that's pushing down. Trying to keep your heels dropped all the time might be what's causing your calf problems.

If you are riding 30 miles a day every day you may just be overreaching. Try having a rest day each week. And dont do the same kind of ride every day. You need to work on your speed and on endurance. Some rides should be short intervals, others long endurance rides at a moderate pace.

There are plenty of books on how to train for racing. Friel's training bible is one of the more popular ones.

Also look for a local race-oriented group ride.