Ok, it shouldnt be a difference between private and multi player. The problem may be if you play on a laggy connection. The delay might interfere with the timing just enough to make a difference. I know that sometimes my fast reload on my fal ends too soon on multiplayer as well. Try reload setting #5 and see if that works. It may noy be as precise on timing, but it should give at least some speed boost. If not let me know