I would have checked my plugs with a clamp type ammeter to see if they are actually drawing any Ah's. Just to be sure..
The coolant sensor might be bad so the ECU thinks the engine are warmer than it is? How long are your LED lit and what are the outside temperature?
When youre trying to start the car tomorrow. Try to pump the primer bulb hard before starting. If starts without any problem after priming its a air leak into the system.
Try to clean the starter, it might be gummed up?