I use a Spider Holster with the long lens adapter - you have to mount it the "wrong" way round for it to balance properly. The advantages are that it puts the weight on your hips rather than nech and you have no problems with straps tangling if you also have binoculars. I can walk miles with it...
Adding - if you're strugg;ing, go to Sennen Cove. At the western end of the horbour car park, beyond the toilet block, is a row of four houses. Chough regularly come to feed at a bird table at the third house along.
Still grey though, I got my Olympus 150-400 from them when supply through official channels was very patchy. Confirmed with Olympus UK later that year at their stand at the Birdfair.
f14 on 60 mm micro 4/3 is physically the same size aperture as f28 on 120mm FF (as f numbers represent a ratio). You could be running into diffraction. I'd try f8 which will give you same DoF as f16 on FF lens of twice the focal length.
Back home now and just going through photos from the last few days of the holiday. Here's male and female American Goldfinches, at Reifel reserve near Vancouver:
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