I thought some more about the suggestions given here....

So - my sweet spot ( prime movie & TV ) viewing is "right on" regarding L&R channels...dead center between 'em and so forming that equilateral triangle ideal. Also ear level seated is right at height of Heils. Levels as set with my trusty RS analoge meter are + - 1/2 db.

Likewise - ear level seated is centered height-wise between the upper and lower center speakers ( here again I refer to the mid / high frequency Heils ) which lastly puts me dead center of my monitor.

Furthermore - I did some measurements from a point on a box i placed om the couch, to each of the four Heils - and after tweaking a bit got all four within 1/2 "

So I'm outside the near-field space if the two center ch speakers, but equa - distance. Upper Heil is angled downward 15 degrees, and lower is angled upward the same. L & R mains are toed in. Stereo subs sit adjacent just outside mains.

If I play with anything I think it will be toe in and pitch ( yaw ).

Any suggestions regarding those kind of adjustments ?