What kind of batteries are you running? FYI 20 minutes is a LONG time to run a brushless setup in a 6+ lb car on 2-3s. Speedo is hotter than your motor means your overgeared. Yes top speed will be about the same as the velenion cause the kv's are so close. Try running a fan on your esc it will help keep temps down. Just a bandaid though, get it geared lower if your gonna run for more than 10 minutes straight.