I just like to be 100% sure somebody is guilty before banning him. Given that it was a private server and you (and probably others) had login and were changing settings, there are potentially other explanations (higher gravity, etc.). It's hard to make a good judgment call given 1 or 2 jumps on an ice map with a high fov making everything look unnaturally fast. Hell, if it was a private server, you could have staged the whole thing (not accusing you of this - just saying it's possible).
I'll let the committee decide.