GPD has said there aren't hard combo TD setups due to time constraints and that the TD issue is caused by the striking running on a "New" system and the grappling on the "old" and they aren't "bridged" or thereabouts.
Which indeed sucks, as it does force you into a kickboxing match even with grapplers, unless TDs are harder to stuff than in the beta, it is really, reeeeally hard to get taken down.
I just hope these things are high on the patch list.