So, doing a DME arc with an HSI is a little different than using an OBS. Being that it may, we have an HSI in the FRASCA simulator (and I'm familiar with one from the other DA-40 in San Diego) I thought that I could have it pegged down. I ended up turning 90 degrees the opposite direction and just messing up entirely. It has to be jotted down as one of my worse flights at CAPT. Then Jenn (my instructor) failed the HSI and the Attitude Indicator, and I was just all over the place for a bit.
Finally, I squared things up and got the aircraft simulator into straight and level flight. I did another DME arc and got it down, and just flew the plane with correct timing and compass turns pretty close enough. Tonight is going to be a fun night on MS Flight Simulator.