Anyone tried fw 1.6 for PX-708a

One of my first observations after updating to 1.06 (on my TDK 840G, btw) is that CD-R recording at 40x seems to be CAV instead of PCAV now. CD-R recording still seems to start around 19-20x, but doesn’t hit 40x until around the 70m mark. (It used to hit 40x by 58m).

Perhaps this is what is meant by the changelog item “Improved high speed write performance for CD-R media.” Slower speed, but overall better recording quality?