I just got my 3.7/6 volt Saber Touch in the mail today and I've been using it about 10 hours now and I must say this thing is really sweet at 6,7 or 8 volts, whatever it is with a carto and 2-3 seconds drags is fantastic!
Now if I were to hit this 6 volts with 5,6 - 8 second drags then I agree that it is a bit much but I guess thats why I like the higher volts so I can take shorter pulls, works very well like that and doesn't heat up much.
For me 3.7 volts requires way to long dragging and not nearly as much enjoyment.
BTW, I got like 8 hours from 2 3 volt batts. Great job Sir Lawerence!