I upgraded my burner to GS0C and my Ritek G04 burn qualities went down dramatically. I rarely had a PI over 50 and a PO over 10 with GS0A, but after I upgraded I was getting PIs in the 100 to 150 range and POs in the 10-15 range. Both seemed to rise towards the end of the disc and the quantity of PO errors was much higher (I used to get a flat line with some spikes but with GS0C it was more of a wave form pattern).
These KProbes are within spec by a good margin but my super picky GE1101 players were having problems, especially towards the end of the discs.
I reverted back to GS0A and my KProbes are better than ever (just did two - 14/5 for the first and 12/7 for the second! 8->) and both discs played flawlessly on my picky players.
Looks like GS0C may not like Ritek G04s . . .