92KK 84WW Olaf
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Don't even think of that last option. The convex [?] side means the shim runs the risk of breaking up with catastrophic consequences.....Question mark is because I would expect the centre to be concave as in thinner through being very slowly hollowed out where the cam lobe contacts the shim surface. Uneven contact places stresses its not designed for.
Either way I reckon its a new shim. Your checking and fitting methodology seems to be spot on, including checking all was right after fitting the new shims.
I think you have highlighted a need to actually measure the shim being removed in case the thickness does not match the stated thickness due to wear, something I hadn't thought about. Even Clymer simply goes on the stated thickness of the old shims for its calculations rather than a micrometer check of the old shims so this would seem to be good advice going forward.
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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles.
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles
Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500