Anyone wanna explain to me what the important stuff means when I scan a burnt disc with this program? Most importantly, what numbers constitute a good vs bad burn? Jesterrace?

And another question, when I look at this, it seems to me like it's not burning anywhere near as well on the 2nd layer. Is that correct, and what might be causing it?

Usually the quality of the scan weighs heavier on the PIF (the lower graph) and the total number there. DL media by nature scores much higher due to the layer-break so yes that is normal. Usually if it is under 5000 total PIF I don't worry too much about it for DL media.