The TUSB driver only has a USB streaming mode (whatever that is. Can't find a manual, so I keep it at "safe". That was the default and none of the other settings seemed to make a difference anyways), and buffer size (I use 4096 since any lower and it has issues with higher sample rates). I did try disabling hardware buffer in MB, but no joy.
I'm not too worried if it can't be solved, like I mentioned WASAPI works fine (just that exclusive mode thing, but I can live with it)
Thanks for your time.