I am trying to improve my pull-up repetitions. I've only started really doing true pull-ups over the last year. I'm 601, 210 lbs, and can do 10 pullups, palms forward, full extension. My goal is 20. I've tried it all. Rows, extra pushup work, pull-up assist machines, etc. I know dropping body weight is an option, but I'm trying to compete in amateur MMA at 205. I work as a police officer, and want to tryout for SWAT, and pullup reps is a test. So, without dropping body weight, I'm trying to raise my reps. Any advice on what has worked for any of you?