Hi Momus.
The first thing I did with mine was to change the seals, a horrible sticky mess. I thought I might have "oversealed it" by putting in the seals too thick, but they bedded down nicely.
Now, the meter. I had a Gaf Memo which is essentially the same camera and the meter was playing me up all the time, in the end I threw it away!
When I got the Chinon I realised what the problem was. The screw in battery cover plate wasn't pressing the battery down enough to make a good connection, so I packed it out and the meter seems ok against other cameras now.
I know I should have the 1.35v battery but it seems ok.
The battery compartment diameter in the Chinon also gives a lot of slop when using the hearing aid battery.
Might be worth a try as the meter read very low when it was playing up.