It looks like, from the photos, your pickup selector switch is set in position 2 when you are taking the measurement. This would have the red wires of both pickups connected to the output and, as such, both pickups are connected together in parallel, so you are measuring the resistances of both pickups at the same time, in parallel, which would be about right for the figures that you're getting. To get the most accurate readings, put the switch in position 1 (bridge only) to measure the neck pickup and position 3 (neck only) to measure the bridge pickup.
That doesn't answer the output level question, but it would be a good idea to get an accurate reading from the pickups first before investigating anything else that could be contributing to a low output.