In theory, you could stack the blue neoprene gaskets to get clearance. They have metal inside them and won't leak. I've had a set for a long long time....no leaks. Those things have been off and on too many times to count.
You've had them double stacked, and also reused them?
The blue neoprene Fel-Pro are what I got now for it. I could try that, and get another set for the other side.
I'll give it a shot when I get off of work.