There's something to be said about backing it out about half a turn if you're experiencing shootdown. To be fair, it happens more to people who use remote lines and turn the on/off too far down...
I had a bottle that on the reg, the pin looked like an upside down top hat. If the on/off was too far down, it choked the output of the reg, causing shootdown under sustained firing. Could be similar issues for people, the issue might not be the gat, it' could be the reg pin...