Since I presently have the above drives installed, thought I might as well make something out of it and compare their scanning performances/consistency. Feel free to contribute scans if you guys have similar setups.
The same disc was used - a DaxonAZ2 disc freshly burnt at 12x on the DW1620. The local DaxonAZ2 media tend to have a consistent PIE hump at ~3 GB so the scan results are kinda expected.
Enjoy, hope this is of use or entertainment value to some of you out there.