It's worth a try. Physical location affects the loading of the room but not latency. The amp/driver delay may have been more agreeable with your mains (by accident) with the other subs you messed with.

The delay on the subs in my room is ~20ms (or 20ft) behind my mains without correction. Without correction they are over a full rotation behind the beat at 60hz and out of phase by 390 degrees lagging or so. This related to a 3db loss in-room.

In a worse case scenario you could be down as much as 12db at the crossover frequency. No kick possible. smile