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It sounds similar to that which my GQ TD42 was afflicted with.
Maybe its too simple but in my case the issue was pinhole / pinholes in the supply side rubber fuel hoses to the fuel pump / filter.(Engine bay in front of the glove box) As fuel demand increased it seems that some air was getting in to the fuel with the result not unlike what you describe.
My mechanic replaced the hoses on the supply side and I once again had a GQ that was happy to rev. Much smother and no more loss of power and vibrations as fuel demand increased.
Perhaps this may help but its cheap and easy to see.
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