when I move back to cs6 the title's dont carry across, they do go apear in clip but they no longer float?
I don't know what you mean by this. Some screenshots would be useful.
Your second problem with the aspect ratios doesn't make a lot of sense to me either. You should be able to motion track footage regardless of the aspect ratio of the composition.
A dynamically linked composition takes its settings from the sequence in Premiere Pro. If your footage doesn't match the sequence, then you'll end up with a compositon that doesn't match the footage when you use Dynamic Link to bring it into After Effects.
So, make sure that your sequence settings match those of the primary footage in Premiere Pro.
Also, consider _not_ using Dynamic Link for these shots and just doing the camera tracking work in After Effects and then rendering and exporting a movie that you drop into your Premiere Pro sequence. Dynamic Link is not always the right tool for the job.