Hi Lukas,
This might not be relevant for you anymore if your move to v2 is complete, but in case it’s still an issue, is it possible the page includes have the same theme selected on the pages?
We had this issue a while back in that any page includes that were set to load the same theme as the top page they were loading from made the whole page flicker as if it was reloading the style sheet again. Changing the page includes to be ‘Theme: Default’ causes the parent theme to carry through to all page includes anyway and stopped the flicker for us.
