One update. We managed to apply your solution and the shadows now appear, but another issue appeared too:
1.- Now the kerning is broken and it adds extra spaces between letters.
2.- It ignores xmaximum, so lines are always out of the screen
3.- It ignores layout "greedy" or "subtitle"
We've tried to fix it by forcing the style even in the kinetic_tags_rpy declaration, but still doesn't work.
Any hints?
Thanks in advance!