OK, I was trying to help as I've been playing with these things since the late 90's when CDR burners first became common. It's just that many of the mids out there now are made by factories that don't really care about quality anymore, and even if they do, like you said, maybe your burner doesn't have a good strategy built in to burn them well.
Like Ian said there used to be quite a community around adding mids to firmwares and doing custom hacked ones to get better burns or more features.
Not many folks do that now with the cheap prices of the burners, plus most actually do great burns now so not much happening.
I really like the NEC based Sony 7240/7260 burners now, and I think they do OK with Dual Layer burns but haven't really done a lot of those lately with mine.
You might want to try posting the question on http://club.myce.com/
in the proper forum as a lot of folks familiar with that burner and others hang out there and might be able to help.