Was it getting rich at altitude? or was the added load from climbing causing it to lean out and lack torque? These engines do make more 'grunt' with a bit more fuel. I have tried going leaner many times and you get a very responsive snappy power delivery which feels great under low loads and on fire trails, but once you get in the hills it falls flat.
It might not be the problem you have though, but keep an open mind to it.
If you haven't had the squish reduced, that's where I'd be looking. Makes the engine much more consistent and resistant to changes in temp, humidity and elevation.
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