Good news, i fixed the rendering of the baked UVs (still in cycles only) Seems I could trick blenders pointcache to store the angular velocity data aka UV in molecular too. Now it is available in each frame, also in rendering (fixed now) and after loading the blend (if baked before).
Fixes are only in the addon, no special build necessary 
Note, there might be some corners and edges still, please test and report back if something is still not working as expected.