The long shank 74X Kadees can be a bit of a challenge. The shims have to be straight and level lengthwise as the extended length shank makes a nice teeter totter on uneven track. I also tend to spend a bit of extra time eyeballing the knuckle height against 805s like your pic. If you don’t use the actual 740 knuckle as the height reference you’ll get a pesky height delta like you’re seeing.
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