I concur about the graphite. I did my aviation chem sci last semester, the whole course is corrosion and tires. I picked and probed corrosion samples and I can attest, bare aluminum contacting steel is bad enough. Graphite will only accelerate problems.
Just my opinion, but the upper being 7075 I didn't worry about galling unless I was going up to and over 120ftlbs. If that were the case, then I would insist on the correct anti-seize. For 6061 I glob anti-seize on every thread.
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