Hi David.
Was the engine up to temp when you took the photos, that is the RPM balance, what did the next page say which give you reading or the - and + balance between the injectors.
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Also drop a bottle of this into your fuel tank next time you add some fuel or just before, it helps clean the tips or jet pattern to a certain extent, it will not cure an injector way out of balance which i doubt yours are, i use this at least twice a year.
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https://www.ebay.co.uk/itm/TWO-2-x-C...e/222076086571