I had another go at a hover but added a 1.4 teleconverter. Still trying to catch up with Harry
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This option is not really worth it as dof is so limited at this magnification and tc's do take away from quality.
Next step is really to increase extension with more tubes, or to use the bellows, and try focus stacking if one will stay still long enough. The big problem with bellows is that with digital they are far from ideal. Particularly if you are racking them in and out to determine a particular magnification or framing, as they act a giant dust pump as far as the sensor is concerned. The snag with moving to a shorter focal length lens is that although magnification will increase markedly, lens to subject distance will take a major hit.
Don