Ugh—! 60!!? That's a God-awful amount of printing and framing. It's tough enough a task to work through (physically and financially) with just 10 frames...
Sure. Nothing says you need to print and mount every single frame; it allows you to more-easily take photos with higher risk of failure (e.g. unpredictably-moving objects (children!) and shallow DOF) and not care that you missed a good fraction of them. Or you can just load the camera once every month or two, whatever.
And another thing-DOF is insanely shallow. I'm afraid I will have a lower percentage of shots in sharp focus.
Yes, you must be very careful with the focus! f/2.8 on 6x7 is about the same DOF as f/1.4 on 35mm but small errors are more obvious because they're no longer hidden by the grain.
f22 to f32 (and a tripod!) for anything at all beyond 3m with the 165mm lens. That lens is capable of exceptionally sharp results but you must accord it respect with technique. Remember the 165LS was designed as a portrait lens, and it works brilliantly as such with its shallow depth of field. In the landscape context though you need to think further away... :)
What's with the underexposures? Lever to Auto on the lens; no need for stopped-down use, if that's what you've inadvertently done...
Whenever you have an image under- or over-exposed by the camera's own meter, repeat the sane scene but meter it with a handheld meter. Record the results. It's possible to get wonky results with hand-held metering too! Repeat errors may indicate a problem with the aperture coupling of the lens, the camera's own meter (if it is fitted with the TTL meter) or not setting the aperture values to the click stops. Remember the 5-stop range of the onboard meter: 2.5 Stops up and down from centre, so even a slight rise or dip of the meter reflects a change in exposure.
I got several 35mm cameras where the original light seals are only short patches where one would expect complete sealing.
The reason for this is not clear to me. Maybe the design did not foresee patches at all, but leaks ocurred and complete sealing hampered easy closing of the back.
About the shallow DOF-now that will lead to some creative possibilities that can't be done with 35mm and APS-C digital.