longer/longest legal shafts available????

I recently went to be fitted for a 913 D3 driver to replace a 983 with a Graphloy Blue Pro Launch S65 shaft that I had custom fit nearly 15 years ago I was thinking it was time to upgrade technology. The set up that I wound up coming down to was the D3 with a 9.5 degree loft, with the Diamana Ahina 72S shaft, red dot swing weight set at the A1. After hitting +45 balls with only one miss hit, I consistently had a 107 -109 MPH club head speed, 156 MPH Ball speed, 12.5degree launch angle, 3100 RPM spin rate,  +270 yd carry and a 1.49 smash factor???? (Not sure what this is) with a standard 45" shaft.

The question I had asked the fitter was why wouldn't/shouldn't I put a 47" shaft in to maximize my club head swing? (radial acceleration being what it is and all) being they did not have a +2" shaft available to hit he recommended that I contacted the custom shop folks to see what they could build. 

With this information, can the custom shop build a driver that will perform as consistently as I have come to expect from my Titleist drivers over the years?

I am a little hesitant to buy a club I have not hit. 

Thanks.

The physics of head speed is correct.  Apparently the human body is not as capable of creating a consistent swing.  The length of the shaft also multiplies a fraction of change in the swing and release, so that off-center distances become larger at the clubhead.

Titleist's former stablemate at Accushnet even used the word Long in the driver name for their 48 inch product.  Certainly didn't revolutionize driver design.  Apparently wasn't as effective as white paint in the market.

Most pro's, in spite of many being over 6 foot, use primarily 44.5-45 inches in their driver lengths - and how many of them even hit 70% in the fairway?  Hence the shortage of stock shafts for the golf course market for drivers over 45-46 inches.  The competition distance guys are the primary market to find this material for up to 48 inch drivers.