Follow up: Yesterday, Feb 1, 2019, I had a rather pleasant conversation with the local FAA Tower Supervisor, KCOS. I informed him I was drafting an MoA to negate having to call each time when flying as a hobbyist. I needed names and addresses for the letter. He gave the requested data but also told me he is NOT required to grant or deny hobbyist, only the 107s. I informed him the FAA states, as a hobbyist I assimilate the Safety Policies of a CBO, such as the AMA. He told me that’s fine, but not required by the FAA as far as hobbyist requesting or informing of flight within 5 miles of airport. Only that I fly safely! Again, I told him I am within 1.5 of his Class C KCOS. He response was “Cool, just be careful, and stay below 400 AGL in the Class C. He told me all the fixed wing are limited to no lower than 500 by FAA. He told me if I am in landing patterns, then keep a closer eye as pilots must come down in altitude. I thanked him for his time, redrafted the letter for the KCOS OPs Supervisor instead. I’ll advise of outcome.
Interesting - he is wrong about the Part 107 - local ATC is not the approving authority, and has specifically been directed by the FAA not to do so:
https://www.faa.gov/documentLibrary/media/Order/JO_7200.23A_Unmanned_Aircraft_Systems_(UAS).pdf