From my readings, I found RICHOJPNR01 to be working pretty well with NEC 2500A, but from the two scans I got here, they definitely don't look that good to me. So I started to suspect that it's the USB 2.0 enclosure that makes bad burning quality. Can anyone justify this?

Burning: NEC2500A (herrie's 1.07V2B5DL) @ 4X
Scanning: BTC 1008 (0059) @ 4X
Software: CDSpeed 3.21
Buffer level stayed constantly between 92-97%