Really, it all comes down to conditions. IE: Ignition, Gas Supply, Crank speed, (
batt supply, connections, wire/cable/switch health) Plug condition, cylinder pressure (
valve and ring health) ambient temperature, and on.
Make notes, and try to optimize the things that you can. One trick I have always relied on is, nearing condition of flood, Open choke -No Choke- close throttle
tightly, spin it over a few times. The turbulence created by the pistons sucking what they can't get will create a drying effect on the plugs. Try it, and try it again, you'll be surprised. I taught myself this trick in sixties and seventies, working AAA, rescuing early risers who felt Tune-ups were for sissies.

Also works on weed whackers and yard tractors!!
My mentor, when I learned Tractor trailer, used to tell me "know your equipment"