Hammerfall 9652 (1st generation) 5.8 ms Creamware ScopeFusion (2nd generation) 8.7ms
that sounds pretty good ... what block sizes are you using?
Tascam US428: it was not even possible to get a clear testtone ....
can you send me the asio debug outputs? that might give me some idea, what's wrong ... also, can you describe the output (noise / clicks every 0.2 seconds or something similar)?
cheers ... tim