Quoted from Leemincy, "Hey, maybe it's the loud speakers! Problem solved."
Sounds like Lee is referring to getting the baby to sleep, rather than a complaint about the Wilsons. :-) I disagree with the above comments which claim the Watt Puppy 6 is a "bright" speaker. It is not...but it is very revealing (which is much different from "bright"). Since Wilson speakers will reveal any deficiencies in your components , room, interconnect/speaker/power cord cables or speaker placement, I believe that Johnjbarlow provides very important information for you in his comments above.
Begin with speaker placement and use a well recorded CD or LP that has significant bass extension. When my new Wilson Sophia Series II were setup by my dealer using Wilson's recommended speaker placement, they played "Pigs, Sheep and Wolves" from Paul Simon's "You're The One" CD, and "brand new '64 dodge" from Greg Brown's "The Poet Game" CD (both came from a demo disc that Wilson provided). So, be sure you are using well recorded discs for evaluation. The old saying, "gargage in, garbage out" has a lot of meaning. For example, no matter how many synergistic, revealing, audiophile systems you audition using Don Henley's "End of the Innocence" cd, the sonics are going to sound poor. The reason: the mastering of this CD is very poor, and consequently so are the sonics.
Next, focus on your room. Are these speakers in a carpeted room or one with hard surfaces? If so, rugs are needed. Do you have accessories, furniture, bookshelves filled with books or LPs, in the room? We might be better able to assist you with room suggestions if there was a more detailed description of your room other than dimensions.
If it is not speaker placement or room issues, then you have a weak link upstream. Unfortunately or fortunately, depending on how you look at it, Wilson speakers will not allow any compromises. Best of luck in resolving your issue.