Terrible Previewing in AE CS6

We have a few systems with AE CS6 and AJA Kona 3's and we can NEVER get them to preview HD spots correctly. We have the latest Drivers and plugins installed for Adobe but any time I try to play back a 1080p sequence it plays out of sync, or drops frames, or just plain stays REALLY REALLY slow. No mater what combination of setting I use I cant get it to play correctly, and even more frustrating is the fact that you can no longer turn off previewing like you did in the older Adobe plugin. All of our sequences are 1080p 29.97 in AE, and ive set the Kona to all kinds of combos in the AE plugin window and in the control panel. Yet our Blackmagic cards can play any resolution at any downconvert or upconvert setting with no hiccups. Whats the deal here?