http://www.opti2-4.com/ <--------- Try this, they advertise the harder you run it the better. I've melted the teflon couplers on the headers of a 115 without seizing.

If the cylinder on one side is dry and seized up you cooked the lubes out. Tune a bit ritcher when the air is hot, dry or humid and thin. You will not get as much power in the summer so don't tune for max power. Tune for a good run.

Check the engine timing, too much advance builds heat fast. Or just set the timing back in the summer a couple degrees.

The rotation of the crankshaft inside the block will have an efect on how the fuel mixture gets to the ports, not much to be done about it.