Doc, I've never used FFFFg in either of my two flinters. So I can't really say whether it would reduce your lock time.

I use GOEX FFFg for most of my loads and use it in the pan also. Works fine and is mighty fast. I've also used FFg in the pan when I was out of FFFg and could not really swear I could tell much difference.

One trick for grinding powder finer is to put some in a small plastic bottle with a few balls and shake it back and forth.