I wouldn't be too concerned about the overnight voltage drop — a battery just off charge will have a 'surface charge' that disappears in a fairly short time, and this drop will increase as the battery ages.
It's what I'd expect to happen.

The current drain doesn't look out of place either, the receptor for your locking system needs some flow to keep it awake, as do various other bits.

.02A is 50 hours for a drop of 1A — if your battery is, say, 60AH?