What's wrong with your Atik Titan? I have been using this camera for quite a long time. The only problem I'm aware of it's power hungry so try connecting it over active USB hub.
At the moment my QHY5 (Orion SSAG) is working on my system. I use it with Celestron AVX from a powered hub. Settings in guide module is Guider QHY5, Via Celestron gps, and enable 'Use pulse CMD' in celestron driver. Not sure what the Use pulse cmd really does, but it works.
Issue I have is I need to focus mannually guider. And to do this, I need a stable reading... or I have lots of issues. when some picture are taken, driver segfault, I need to relaunch indiserver... so it's a pain.
I want a stable guider
NB : for titan : my twos titans have issues under all linuxes I've tried, over all hub USB I've tried (it happens...)