I don't think it was leaning out from added load while climbing as it was also suffering on the roads.
I do think you are right about the squish though. One of the first things I did was replace the piston since this had never been done and was at around 350 hours. I removed 2 base gaskets but was unable to measure them as they tore when I lifted the barrel. On reassembly I used what I thought was similar thickness gaskets and chose the thickness to set the piston level with the bottom of the exhaust port on BDC. If I have used thicker gaskets I will have opened up the already wide stock squish band. This has got to be a priority.
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