2 are better ,it loads the room better but it doesn't sound as it would help your current problem. Raising the crossover points on the subs may well make things worse. It sounds like you are getting cancellation of frequencies due to room reflections. Do you have a lot of glass in your new listening room? Are most of the walls highly reflective?You might want to try to damp them. Get a computer program that shows where to place the speakers or try moving them around the room. Experiment with angling them inward so their tweeter axis cross just ahead of your listening position. Don't buy anything before you attempt to see what is wrong with the room.
2 subs?
I have Zu druid speakers with 1 mini method sub. I have been fighting a really thin sounding sound since I moved the gear to a new home. I am trying to optimize the room, but....would adding a second sub help at all. Also, the base is not really the problem, instead its the whole midrange...it is just hollow sounding. I guess I am wondering could I add a second Mini method sub and drop the level dial and raise the crossover to help with the thin sound.