I have temporarily set the max profit to 0.25% because with it at 1% nakowa was able to take huge chunks of the bankroll over and over, as he has demonstrated time and time again.
Are you saying that he does have a system that works? Have you checked your random number generator (maybe it's being run in a VM, which are notorious for not providing enough enthropy to the OS?)? It just seems extreme that the administrator of a gambling site is afraid of one gambler causing him ruin, and that that one user apparently does so consistently?