I use PFS3 and it can be hit and miss with the Max Transfer. Normally OS 3.2 will set this to the max. But have had SD card issues with this setting. I use DOS 0x50465303. But this is on version 19.2.
Now I have been brave and use Tony Willens Version 20.0 BETA which works great! By the way 19.2 (Current public release) doesn’t use anything past 1024 block size even though HDToolBox will set it. Version 20.0 does and works well, even fixes a tonne of issues I was having with 19.2.