Total PIF of 136 (as shown above) is really a very nice scan. You state that your average total PIF is closer to 700, but that is still not bad. Your results are about what I normally get with the Value Line TYG02.
I'm not certain why your transfer rate test shows a dip at around 3.8 gig. Could it be that your cpu got busy with something else and quit paying attention to Cdspeed momentarily? Have you tried running the TRT again on this disc?