DonM
Just a word from my personal experience, Don.... I started at 48 or 47.5, IIRC, after Bernie Baymiller's advice (several years ago). My miss was high and right.....a popup, but a long popup. My good drives were definitely longer.....maybe as much as 20 yards. But, as you say, I felt I was too inconsistent with it, so my solution was to shorten it 1/2 inch at the end of every season when I regripped it. I still have the same driver (an Integra 450 Beta Titanium), and it's still in my bag, but I've settled on 46 inches at the length at which I personally get the best
combination of "some" distance and good accuracy. I've experimented with other drivers (in fact just now completed a sale of a Taylormade M2 that didn't suit me), but this old Integra has stayed in the bag for many years now!
You've started me thinking though.....I could put an extension in the end of the shaft and choke down on the shaft when I want normal accuracy, and go up towards the end when I want to TRY to bomb it on a wide open hole.....the best of BOTH worlds!!!