Well, I successfully loaded Liggy’s 1.5 firmware for booktype setting to ROM for DVD+R disks for the exact burner model (7570A) and re-burned the disk.
It didn’t play on the older DVD, so it must be a profile/codec issue I guess.
Which returns to the original question:
What is the maximum compatible profile?
What is the simplest way to print out the profile for a disk? Are there some very standard bit-rates, aspect ratios, resolutions, audio encoding, etc. that work the best (in this sense works with the most variety of existing players)?