As of late I've come to the conclusion that I over weathered my earlier guns. Rather than just sell them and start from scratch I opted to simply remove the guns, strip them, repaint them.
I have also learned that Tamiya Dark Yellow wasn't the correct color for German guns/vehicles. It produced a too dark effect, I opted to use Tamiya Buff and applied a MIG Filter. I think the results speak for themselves. Here are the before and after photos of the Flak 37's and Pak 40's.