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Any thoughts or suggestions?
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Looks like a nice theater.
The RadioShack meter should output sufficient level for most any soundcard. Usually we use the meter on its 80dBSPL scale. If the battery shows good, I don't see a problem there.
Hopefully you are using a mono RCA cable from the meter and connecting that to a mono to stereo adapter at the soundcards line-in jack. The intermittent change in level you mentioned may be a result of the adapter not making great contact at the plug. You could play around with that a bit.
Generally we start measuring with sub(s) only, with the mains shut off, and the receiver in stereo mode, with all effects off. This allows you to examine and equalize the subs without the influence of any other speakers.
Two subs are difficult to equalize, but has the advantage of using their positioning as a form of equalization of the overall signal.
Anyway, you have a peak at ~36Hz. You need to equalize it out. Not a big deal. Once that peaks gone, you'll be able to turn up the wholesale level of the sub to match the level of the mains and it will sound much better.
I would start with a sub only measurement and show us that....
brucek