Unfortunately, the clones also weren't clock stable at all - they were fine at 115200 and such, but if you pushed them up to 3Mbaud or so, they mostly read/wrot

Unfortunately, the clones also weren't clock stable at all - they were fine at 115200 and such, but if you pushed them up to 3Mbaud or so, they mostly read/wrote garbage. I put a few of them on a good scope and the timing was just all over the place. The legit FTDIs are rock solid on their timing even up at high baud rates. So I got some legit chips and just did the surface mount rework to replace the fakes with the legit ones and solved my problem. I had no idea when I got the adapters that they had fake chips on them. :/