Higher Idle really helps
I can drop my idle to 750 or less and it will spin a time or two to start. If I keep the idle at 850 or more, it starts as soon as you hit the key. GSK, #11 plate, every tamper proof cavity violated and it starts immediately.
Increase the idle to see if it helps. You can always set it back down if does not help.
jjw
ND