Here’s a scan of a 16x burn using my NEC 3500AG with Fuji 8x DVD+R (TY). Is this ok? The quality score is only 48
You are using a very old 812S firmware, you may want to upgrade and check again, even though the graph look fine. Try using KProbe and see if you get a similar result. Run a transfer rate test through CD-DVD Speed also. If the backup (assuming movie) plays fine in your standalone(s), then you have nothing to worry about.