today's fitting experience

[timwat]

I know little about equipment choices except what's in the popular magazines, so here is today's experience and question:

I'm currently an 11.4 index, been hitting an '09 Burner with stock regular shaft.  Lessons have recently corrected a host of swing flaws, so now my normal driver ball flight is a gentle draw.  Drives average to ~240 over last several rounds.  Misses are still occasional weak, high right pushes of only ~200.

Today I played the last 11 holes of the round with a brand new R11, stock S shaft (the Fujikura Blur 60).  My son just purchased one and I started hitting it on number 8.

First drive with the R11 is quite low, straight...and 282 yds.  Every drive for the rest of the round was low, boring flight path...and long.  280, 276, 272...and about the only miss I could wring out of the club was a total overswing - which yielded the high right push.

The R11 was set up neutral, standard lie, and the weights in "draw" config.  At first the shaft felt as stiff as a 2x4 to me, but of course after hitting the first drive 282 I warmed up to it considerably.

My question:  Is the newfound straightness and length because I should now be using an S shaft?  Is it because the R11 is that much a better club than the '09 Burner?  Is it all just dumb luck and the stars aligned for 12 holes?

I'm hesitant to give in to the temptation to immediately go out and buy a new driver, and unsure what the takeaway from today's anecdotal experience ought to be.

Besides the fact that I still can't break 80 until I learn to putt.