You monitors should form a triangle w/ your head at the point. 6 foot spread between speakers mean your head should be 6 feet away situated midway between them. Ideally. If you are too close you end up having a "hole" in the middle that your mind fills in. Farther away and you get more of the room rather than direct sound (which is the point of near field speakers).
To truely propagate bass waves you need a big room - take a look at hammond organ drawbars or a mini-moog which mimics the convention. 32' means a 32 foot pipe producing the sound, ergo a 32 foot room for the wave to fully form. Again, ideally, and most speakers aren't going to replicate such a low note (or growl).
Your problem could be room, speakers, experience,- and probably some of all three. An untreated room will sound unbalanced - a lot of high-frequency bouncing around and bass waves rebounding upon themselves and causes peaks and nulls. If you've ever moved into a new place or painted an empty room you can hear the reverb and flutter echos, which mess up your montioring. You notice it mostly in the highs, but it does the same for bass. There are plenty of threads about room treatment here and elsewhere.
Speakers - get to know them and how they sound. Listen to different styles of music on them. Studio monitors shouldn't flatter the sound - they should be flat as widely as possible. At the studio I frequent they use big genlecs. They are brutal. Flabby bass will sound flabby, not rounded off and low freq noise will be heard (and felt) instead rolled off. And highs will shriek and scratch your eardrums. They used to have yamas but moved to med adams for the near field. They are smaller in the bottom and the ribbon tweeter flattens the highs. If a song sounds good on both of them, it will translate well. at home I use old yamas and have gotten to know them - stuff I do seems to translate well and if something sounds scratchy on the beryllium tweeters it is too much and the 8 inch woofers let me catch most low noise/misshapes.
Which brings me to experience. Buy the best speakers you can afford and stick w/ them for a while so you get to know them. Put some furniture (bed/futon/couch) in the control room to suck up the bass as well as highs if you can't properly treat it. Book shelves (w/ spaced books, not your wife's nick-nacks) also work well dispersing the sound it doesn't soak up. Then buy a stack of CDs and burn your mixes. Test them in the living room w/ bookshelf speakers, headphones and in the car. Listen carefully to see how the mix performs in different enviorments/systems and use that for feedback. And roll off the bottom of tracks if you don't have a big system to listen on. Bottom noise will suck up headroom and you'll never know it using smaller speakers.
It takes an investment of time to learn your system and, as importantly, train your ears. But the above steps can speed it all up, esp. if you are young and haven't lost your hearing through age. Start young, and realize most of the mastering engineers are older and have worse hearing than you, but they know "what" to listen for.