yes i have and i am not having issues with either. i have a buddy who uses it without and he supplements occasionally. i did it from the beginnning of switching over so its just what worked out the gate.its definately optional and some argue its too much, i cant argue with your results though. your gg4 looks better than mine and is arguable some of the nicer pics i see out there.
Have you tried without the Epsom? With over 6% Mg I'd be surprised they need anymore.