I understand...
I believe the OP's issue *is* high DPC Latency.
Until that issue is sorted, it doesn't matter what audio interface (or how it's connected), he's going to experience glitches.
Strip the machine down to the most basic essentials.
If DPC Latency is still high (and the OP has flashed the BIOS both up/down), it's time to swap the motherboard.