· Blaberus craniifer
When you say splits off, do you mean the the other outlets are coming from the second set of screws on the GCFI? If that is the case, you could try connecting the other outlets to the GCFI main screws. If the other outlets are requiring GCFI protection, then you need to replace the other outlets with GCFI ones. That way, not all the loads would be going through one GCFI. That should reduce the issue of the one tripping.It seems that all of our outdoor outlets (the garage, the front porch, and the deck in the back yard) are all on the same circuit. Where it gets interesting is if you go to the basement and check out the breaker box - the circuit comes off the box and goes directly into a GCFI, then splits off to the various external outlets.
Also like everyone has said, try using LED spots to cut down on the wattage being used. Or run entension cords from other circuits.