An overload of melons can hurt size and quality. You have some medium melons and one/ones unknown which doesn't help giving help.
I have seen a medium or so melon like Sangria have 5 melons in the first set. They tended to be 18 or 19 pounds apiece and not top quality as Sangria can be about the best there is. two 25 pound Sangrias are better than 5 only fair ones.

In your case, it is partly a matter of how healthy the plants are. If they are vibrantly healthy, they can handle 3 at a time. If average, only 2.

For small varieties...let them set what they will. Very healthy vines can make a nice second setting too.

I let my melons set as many fruit as they want. The plant will naturally abort some of the fruit. So I let the plant alone and let it do it's own thing. The plant will decide which fruit will mature and which won't.