Speaker toe in

I've been experimenting to dial in my Harbeth Super HL5 Plus speakers now that I have my custom stands.  Sitting flat on the stands, they lose some of the midrange and treble.  Tilting them back a bit really opened them up.  They sound best to me either facing straight ahead or with just a hair of toe-in.  I tried some more aggressive toe-in and didn't like it.

wow ¡!¡! i tried the more extreme toe-in position with the intersection about a foot in front of me face... i am liking it. deeper soundstage and the AirPulse Model 1 always had invisible midrange.. but now it is ghostly. soundstage width had decreased but I am slowly inching the speakers wider.. instrument positioning in the soundstage is improved as well...

update #1.. the monitors do not like to be too close to sidewalls.. 

It is simply wrong to state categorically that any particular degree of toe-in is optimal and anything else indicates some kind of problem.  All adjustments--placement, toe-in, rake angle (tilt back) are specific to a particular speaker model, room acoustics, placement of the speaker and listener, listener taste, etc.  

With most speakers and situations, the ideal degree of toe-in involves trade-offs.  With little or no toe-in, the soundstage will tend to be wide and open sounding, but, the center image might not be as strong and pin-point tight.  By increasing toe-in that center image will tend to get more pronounced, but, usually the trade-off is a woundstage that does not sound as expansive, or the listener does not feel quite as immersed in the soundfield.  The "right" toe-in is where the listener is most satisfied with the balance of trade-offs.