Is there a way to communicate with the moderators on ELL?
There are several.
You have already found one, although meta is not exactly ideal for discussions you wish to have exclusively with the diamonds.
You can also start a gallery chat room (you have more than enough rep) and go with that; others can see it if they happen to pass by, but the rubbernecking is likely to be much less significant.
Or you can just flag some suitable post with the action you want them to take, if that's applicable. (If there's a lot of details you need to add to the request, you can use a deleted answer to carry the extra text that doesn't fit in the flag dialog, then flag that answer. Deleted questions cannot be edited, otherwise I'd suggest that.)