Nice finds and keep experimenting with settings.
I have gone full hunts with a recovery speed of 8. Its blazing fast and can certainly pick out goodies. One place I have hunted over and over and never found one old coin. It is a small grassy area probably 5 feet wide and 15 feet long. One day I was coming to the end of my hunt and was extremely tired. I threw my settings into park2 and cranked recovery to 8, iron bias 1 and was just messing around at this little grassy patch. All of a sudden wheat cents starting appearing as well as one silver dime. Why didn't my other settings pickup these coins? So I fooled around with my recovery speed and soon as I dropped it to 6 or less, I couldn't pick up the coins. So for a good long while, I went back to some of my other sites and used these settings and have found a bunch of additional silver dimes and wheat pennies. It was definitely an eye opener for me.
In another case, I was fooling around with the iron bias at a park I frequent and decided to run it at a minimum of 5 in an particular area. Nothing amazing appeared but I was finding 4-6" clad in the iron infested junk hole.
You are doing good!