I think lower temps are better for the retardation of beetle eggs hatching; IF any viable eggs are present.
Consider this though, the average temperature of the regions where tobacco originates is much higher.
The answer may depend upon how long they are being stored as well and what effects does temperature have on aging? Probably a couple factors going on here; the oils may evaporate faster at an elevated temp. But some of the chemical reactions going on during the aging process are more likely to happen, or occur faster at elevated temps. This could be good, or this could be bad, depending upon the final byproducts.
To be honest, I don't have any definitive answers, but some different things to think about.

I think the consensus is lower is better. That is where I keep mine, between 60-66 deg, but that is more of convenience because I keep them in the basement out of the way and where there are the least fluctuating temperatures in my home.