Motorcycle Questions? Ask a Mechanic.
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This does sound like the elevation may be an issue here.The hot water usually releases at the top of the engine to flow into the radiator and the cooler water enters towards the bottom.Since the cooler water has to travel uphill it may not be pushing through properly causing this here.
If you can I would remount it to where it is almost level with the engine.If it continues to over heat you may need a bigger radiator.
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That would be a good idea to install a low pressure pump if you can find one to fit.This should resolve this issue as well instead of re routing the radiator or hoses.If the fault continues then the radiator itself may need upgraded to a larger one.