Dear Shawn,
You make an assumption : < The maximum allowed energy scale of non-gravitational interaction is dependent on how much the metric deviates from the metric of at spacetime.> In connection with your assumption I can add that I tried to solve the problem of interrelation of mass and charge of proton. Can the charge of proton be more then well-known elementary charge? The result is the next: the charge of proton is the charge which is maximum possible for proton. For solution of the problem the process of neutron star creation was studied with the charge. A condition of the creation is that density of zero electromagnetic energy can not exceed the density of gravitational energy otherwise the star can not be created by gravitation. The proton at the level of atoms is similar to neutron star according to the Theory of Infinite Hierarchical Nesting of Matter (see my essay). I found a lot of your paper at vixra.org , for example: http://vixra.org/abs/1002.0009 , about dark matter. I have there a paper too about dark matter: Fedosin S.G. Cosmic Red Shift, Microwave Background, and New Particles. Galilean Electrodynamics, Spring 2012, Vol. 23, Special Issues No. 1, P. 3 - 13.