According to these lines you should set max_fsm_pages to at the very least 5306160
You have a humongous amount of RAM, you could set it to 10000000
INFO: free space map: 79 relations, 1948399 pages stored; 5306160 total pages needed
DETAIL: Allocated FSM size: 500 relations + 2000000 pages = 11769 kB shared memory.
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