Recurring fuel leak on the bottom of carburetor

[ODFever]

I had a fuel leak on the bottom of the carburetor again. I replaced the gasket on the 1/2" bolt on the bottom of the carburetor, which stopped the leak. The gasket was inflexible. This is the third time I had to replace the gasket in 1.5 years of owning my Model A. I ONLY fuel up with ethanol free 87 or 89 octane. I bought 3 carburetor gasket kits from Mike's A-Ford-Able, and have used the gaskets from those kits. I don't use any fuel additives. When the fuel leaks, it stinks up my garage. The fumes get into my home A/C air handler, and my whole house smells like gas. The fumes nauseate my wife. I wish I had a detached garage, but I'm stuck with what I have. I really don't want my house to smell like fuel again.

Is there any way to prevent this red gasket from hardening?

Are there any tell tale signs that the gasket needs to be replaced?

Should I add gasket replacement to my preventative maintenance schedule and replace it every 4-5 months?

Thank y'all for any input.