Congratulations on the silver coins. They are always a welcome sight. From what you posted it looks like you are going by the numbers to choose your targets. Most of the time I use a machine that does not have a ready out and when I use one that does I ignore the numbers and go by the tones. I have found that position, depth and how the soil has worked on the coins and jewelry can change the numbers.
I dig lots of trash, but I also dig lots of treasure. If it has a high tone, mid tone or mixed tones I will dig it. I dig lots of tabs, foil and can slaw, but I also dig the small gold and silver and the eaten up Indian head pennies that the soil has worked on.
Just my opinion and what works for me. If this helps you great, if not ignore it. Stay safe, good luck and keep swingin.
(Detecting 22 years with over 188,000 coins, 2200 pieces of gold and silver and over 1100 civil war artifacts.)