That certainly is a lot of oil up in there hemi-itis

My recommendation for sealing the bolt threads would be Hylomar Universal Blue. Use sparingly, no need to coat the snot out of them and cause other issues like not getting a proper torque reading.
http://www.hylomarsealant.com/

Now when it comes to maintaining the bolt torque, gasket materials have a direct effect on clamp load longevity.
Soft highly conformable materials tend to loose bolt torque at a faster rate than a dense material. This is mainly due to resisting crush, thereby loading the fastener and maintaining the tension between the two components.
Just imagine if you were to put rubber washers behind your lug nuts what might happen

The other issue is the make up of the gasket material itself. There are a number of different fibers and chemical binders that are mixed together as a formula to create materials with different properties and specifications. All have their place but apparently the ones you have used should not be placed on your motor.

Gasket design can be another factor in aiding long term performance.
Using the Hemi as an example. Gaskets that come in the "Blue package" are profiled to match the cylinder head along the bottom profile. Many times this is done to keep or minimize the gasket materials exposure to engine oil and attempt to reduce wicking effects of the gasket material which in turn causes bolt torque loss.

Superformance takes a all hands on deck approach to the Hemi intake gasket with a Premium material that was developed to reduce fluid wicking over a long period of time and maintain bolt torque. Adding to that the gasket design has a full skirt across the bottom to help maintain structural integrity in the vulnerable area at the base of the port.

The 426 Hemi is a challenging motor on many levels so please don't overlook the importance of having the proper, matching angles top to bottom, front to back or you'll get some good use out of that new hoist