I read your postings with interest, but didn't post because I could not offer a solution. About 18 months ago a similar string was started and I remember that someone posted a link where you could buy 50 CDs in a single pack - but by various makers - so that you could see what works and what doesn't in your CD writer. I bought these and realised that there was little difference between very expenive and 'normally' priced CDs but those at the cheap & cheerful end wouldn't work for me. Having said that, my daughter bought the same pack but now only uses the cost effective CD-Rs. She only rarely burns a coaster, so I guess that it's horses for courses.
One last thing though, I wish I could remember where I bought the CDs from [I've changed my forum name & cannot access my previous postings] as I am wondering if the same kind of thing is available for DVDs