FX ROYALE 500 WITH HUMA REGULATOR

That the first time I write on this forum, every day I read about all topic here, I want to replace the factory regulator due to poi going up and down if I don`t pull the trigger every 10 to 15 seconds .My technic of shouting is very good, I am able to put the 8 pellets of my walther rotek magazine in a quarter size at 90 yards on a calme weather day. If any body is able to give me advice on Huma regulator , It will be appreciate.