Having had 3 and 6 FG set up 92's operating side by side and flying in both fairly regularly (with two different operators) , if you keep your MR vibes low and don't wait for them to flag to do adjustments , I have found stuff all difference, the 3 FG set up gives you better payloads approx. 1 person over the 6 FG, if I was getting my own 92 I'd only get 3 FG's.
The operator I'm with now has all their machines with 6 FG's, all our machines we fine tune under .1 ips on the MR , we think the 6 FG's are just dead weight but aren't allowed to remove 3.