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There is another option for increasing compression without doing much engine mods.
Coating the cylinders.
I've seen companies coat cylinders with some hard material.
It's possible to just add a coating on the piston, that will hopefully last.
Or, like mentioned, just change the piston shape or size, to one that's giving you a higher compression.
As far as smaller crankshaft, I would avoid if possible.
A smaller crankshaft reduces torque by a large amount, and doesn't allow the fuel to burn completely.
If you're going to do a crankshaft swap, it would make sense to get a longer crankshaft throw. They're more optimized to use all the energy available in the fuel, meaning cooler exhaust, less wasted energy, and more torque.
Short throw crankshafts are good if you want higher RPM.
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