I'm glad you found something that works, but you could have saved yourself some work doing a sub crawl. Put one sub in a seated position, play some test tones and find out what location the sub sounds best/loudest and place the sub there.
If you have your subs in 2 different places, there is a good chance you'll run into cancellation issues. 2 subs can actually have less output at the listening position than one. You'll need an SPL meter and someone who'll adjust phase on each sub, while you watch your meter, to get thing just right.