Colder plugs?

Just depends on where I get my fuel. I live in the boondocks and the nearest station is a little place that only has 87 octane ethanol. When I have to get fuel there I add some seafoam or additive. TDC was verified when I built the motor. The timing light is an older NAPA inductive light. No dial. Possible the balancer slipped or the lights off I guess. Doesn't appear to have any detonation issues or kick back on the starter when hot though