So far I've only found 1 disc type which will write at 52X without slowdowns: Samsung CD-R in jewel cases....not samsung in spindles they slows down near the end. All samsungs have plasmon ATIP.
TY = 48X, but no slowdowns
CMC = 52X but slows down
Prodisc = 52X but slows down
Ritek = 52X but slows down, often slows down to 16X!!
Nan-Ya = 52X but slows down
Moser baer india = 52X but slows down
Mitsubishi = 48X and slows down
Tried a lot of different discs, they are more or less the same...SLOWDOWNS