Without knowing specifically what your set up looks like it is hard to tell when you will have maxed out the toe in but, assuming that you are listening in a traditional triangle set up, or something close to that, take a piece of paper and draw your triangle. Then draw a perpendicular line from the front of the speaker. Then measure the degree of the angle from the front of the speaker to the center of your listening chair. Then draw a line half way between the chair and the perpendicular line. Then measure the distance in degrees from to the 'middle line' to the perpendicular line. You should get something like 22.5 degrees. But, whatever. Now with the axis of your speaker pointed at your head (in the listening chair :-), you can toe your speaker(s) inward up to the degree you measured (i.e. 22.5?). Once you have done this listen for a while and start moving the speakers axis back toward your head, a couple of degrees at a time. For the fun of it I bet you end up with toe in about 15 degrees from your head.
Sorry for the length of this post. I'm sure there was a much easier way of saying this.
Sorry for the length of this post. I'm sure there was a much easier way of saying this.