The B&J disks might be knockoffs, but if they are working so well they could be genuine. Have you run any scans on them? Do they say Made in Japan on the label? TY is only made in Japan, and if you are in the US, the cakebox label is supposed to show country of manufacture.
Some people have good luck with the MII single layer Verbatims. Arachne has had consistent results with them. Most seem to prefer the Taiwanese made Verbatims though.
Taiyo Yuden does make -R dual layer disks, but they aren’t well respected around here, and are very hard to get outside of Japan. The best dual layer disks are made by Mitsubishi, sold under the Verbatim brand usually. The ones made in Sinagpore are more consistent than the MII versions. It is getting much harder to find the MIS dual layers buying online, since the MII disks are showing up in both the slower MKM001 variety and the MKM003.