I'll post a few negatives and photos tomorrow but the negatives are pretty light.
Timor I assure, with my camera at least, it's very possible to overexpose at those settings.
"but what is an ap ring? The camera is completely manual with no ae or af."
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AP ring is a Bribrius slang for "aperture ring".

If the negatives are "pretty light" it indicates under exposure, over exposure makes negs dark. OK, I think the meter is toasted. If you develop own b&w shoot one roll with setting taken from your dslr, develop for normal contrast and let see.
Pictures you post by now are showing only small over exposure, but then I would not trust too much labs developing colour film nowadays.
Keep shooting dry in very bright conditions, maybe the current will revive dried up condensers, Olympus after all was using good stuff, supposedly.