Drummers are brilliant.I've been having the same problem, here's food for thought:
You can use two adjustable butt plates on either end. Might have to pay a bit extra, but a quick image search shows DW and Dunnet make adjustable butt plates. Example; the DW has three positions, if you have one of these at either end you (in theory) can make the right adjustments to have the snares completely off or on tight.
The DW was just a quick image search to give an example, I don't own one. There should be more adjustable butt plates around, years ago I saw one that you can twist forever until it tightens... and yes, it was a butt plate.Balance - do you think double butt plates will actually work? I have a few DW's with the 3 way butt and the snare is on (mid), barely on (loose), or choked (tightest), so for me, the "tightest" position is useless. Unless I am doing something wrong.
Hmm... does this butt plate give you large adjustments or small ones? Like I said, I don't own one but am very interested in it now as I have a few shells! To answer your question anyway, I would adjust the tightest position first then the rest should take care of itself. Let me know how you go.So question - when you attach the wires, what position are you in? I am in the middle so maybe I should be in the "loosest"?