Q:

The singular and plural has been a major issue for me as a pro se first-timer

Nothing I have seen sounds right for my little invention, so I wonder what I'm missing. The invention needs at least one X somewhere on at least the first side of Y for the minimum invention to work. In the preferred embodiments, one or more additional X at particular locations and/or slope directions on Y adds value and narrows the claim. So the dependent claims need to say: at least one X on the second side of Y.  at least one X proximal to the distal end of Y.  at least one X proximal to the proximal end of Y.  at least one X to slope left.  at least one X to slope right. What is a good way to say this? 

A:

You could draft it like this:

Device comprising: at least one X, the at least one X comprising a first X at location A. 
Device according to claim 1, wherein the at least one X further comprises a second X at location B. 
Device according to claim 1, wherein the at least one X further comprises a second X at location C.

