An answer to one question: KProbe works with most drives with a MediaTek chipset, and that model of LG drive may have a supported chipset. Most LiteOn drives sport MediaTek chipsets. The Optiarc, however, has an NEC chipset (may be badged as Renesas). You shouldn't need a modified firmware to use KProbe, and I don't think that has been the case for any drive.
Lock the scanning speed to 8x for the full-sized drives, as speeds above that may exaggerate errors on discs that are perfectly fine; "max" is probably fine for the slim LG drive.
The low quality score on the scan with the LiteOn likely comes from the high PIE rate. While this is a bit out of the norm for MKM 001 burns, it's still not horrible. The poorer rating may also come from the clump of PIF, which is equally abnormal but shouldn't be a major show-stopper. What's the write speed you used?
And are you using three different discs in each of the scans--if so, did you use the same drive to scan and burn each one?