I tried testing Victory points but it's harder to tell what's going on with the RNG. Probably need bigger islands to test on, especially for testing VP dom spread for a dom-1 nation. It doesn't look to me like temple count makes a difference to dom spread from VPs. I ran a few repeat tests.
Dom-10 nation with spread from a victory point only
Code:
Turn Candles (2-prov island)
10 5 5
20 10 11
30 17 17
Dom-5 nation with 25 temples (none on island) spread from a victory point only
Code:
Turn Candles (2-prov island)
10 4 1 6 5 2
20 9 4 12 12 5
30 13 10 16 18 8
Dom-5 nation with 1 temples (none on island) spread from a victory point only
Code:
Turn Candles (2-prov island)
10 4 4 2
20 6 10 5
30 9 (max) 10
One item of note is that VPs and Juggernauts do spread dominion for EA Mictlan.