It is apparent that your problem is associated with high frequency sounds reflecting off of the side walls. I agree with your friend. Here is a radical expirement for you on toe in - you can use it as a starting point. If your speaker location is about 25 degrees in from the direction your speakers are pointed, toe them in til they are 25 degrees past your listening position and see what your hear then. Assuming you have effectively tuned out the 1st sidewall reflections with that manuever (you will be surprised at the good effect it can have on pin point imaging) you can then toe them incrementally back toward the listening position until you like what you hear. Gsreat tweek - its free. Enjoy.
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