What is the recommended PPM when foliar feeding L-amino acids
I know that some of the amino acids you listed are commonly found in fish fertilizer. I haven't read any studies on the use of these amino acids individually and not sure where you would purchase them separately. If you're just experimenting in your own garden I would just use fish fertilizer according to the label directions. If you look for fish fertilizer studies you'll probably find more info.

Also, I've never heard of these opening up the stomata of the plants. The only references I've read indicate that foliar sprays are best applied in the early morning or late day when the stomata is already open. This is how the nutrients get absorbed from the leaves.

I don't know that I would want to intentionally manipulate stomata closure. The plant knows when it needs to breath.

Where did you read the above info? I'd be interested in seeing it.