I'd say too much cleaner also. In my home made cleaner similar to Diamonds, I use two drops of Aramith cleaner diluted 20% for 8 balls. That's about 10% the amount of cleaner that you use.
Rexus has his mix of Aramith that is much more diluted than mine, but he sprays it on I think, where I put a drop on a finger and dab that on 4 balls then another drop for the other 4 balls. It would be interesting to try and figure out between Rexus's way, and mine, what way actually uses more cleaner. Not that it matters I guess as both of our ways seems to work with drastically less cleaner than how you are using it with 2 drops per ball.
I do know that before I diluted it that 20% and just used it full strength with 2 drops per 4 balls, I had to manually wipe them off with a microfiber cloth for a bit as without that they played slightly clingy.