I absolutely hate doing those two missions because of the crashing problem. The worst part is in SM if I'm with my buddy, we both crash. I end up back at the starting point and the game acts like I never did the flashpoint.
The only time I actually get to credit for completing it if I'm in a random group and someone made it through. I rarely get to Coruscant/Drommand Kaas without crashing. Hard Mode or Story Mode. It matters not, I crash to desktop every damn time!