Good news. Carey's Cycle here in Ogden installed the new ECU on my 07 Thursday. I took it out on a 300+ mile loop today. Here's the rundown.
Altitudes from 4300 ft here in Ogden to over 10,000 feet over the pass from Evanston WY to Kamas UT. Several 3000+ feet elevation changes. One of my favorite rides. On this loop, I had always experience severe surging. Temps ranged from 15 to 40 deg F. Once, after a leisurely decent of about 1500 feet, I thought I noticed a hesitation after giving it a little throttle mid way through a curve but I have been second gussing that observation ever since. If it was real, it was fairly mild and I was unable to repeat it. Other than that (I have to stick with my first impression), the ride was the smoothest I have ever experienced. The FJR responded to mild adjustments, both increasing and decreasing, of throttle without noticeable hesitation or surging. This was a huge improvement in those long tight varying radius turns compared to the hesitation-and-surge that used to make life a little too exciting. I went through all of the conservative riding routines and easy climbs that used to result in surging. No problems. Sweet!
But enough of trying to list the facts. The real story is the return leg of my loop over East Canyon. Instead of trying hard to cause and then "detect" a hesitation/surge, I just had fun. The real result in the ECU change is in the confidence I gained in being able to accelerate and decelerate at will, without any surprises. No more slowing more than should be necessary going into the corners! The bike now gives me what I want, WHEN I want it.
My chicken strip is now a little narrower. Or to summarize this whole report, this is the first time I have ever scraped my boot in the corners.