Try changing the governor to ondemand up the clock speed a little, and also reduce the number of profiles with unique governors. I had a problem with the Walkman app 'skipping' when the screen went to sleep using ondemandx. I switched to ondemand for all profiles, the 'skipping' stopped.
I also had an issue with an incoming phone call. The phone app rang but I could not access the call. The app I was using had frozen. I attribute this last issue to a very very low memory situation and have not seen it happen again.
BTW I do not believe either of these issues are related to the vengeance kernel. First issue, I think it's the lockscreen mod and walkman app not playing nice. Second issue is because I have too many memory tweaks going on my arc s.