This is were I saw using the L-358 you can meter each light with the dome recess by pointing at the strobe to measure, and do not have to tun off the other strobes. I knew I saw it somewere. I always metered one at a time, with the others off.
Her is the link:
http://www.studiolighting.net/digital-photography-one-on-one-e002-using-a-light-meter/
Not sure if this is the right or wrong way.