Wayner, you may not need to move them to get an improvement, depending on what the surface of the wall is like to the inside and behind your speakers. If it is hard and reflective, you could probably benefit from absorption there - it is easy enough to experiment.
Just get a small decorative cushion or a folded middle sized towel and put it on the surface just to the inside (that is, between) the speakers.
As it is, there is a fairly strong radiation to the rear as the sound from the front diffracts around the edge. If most of this energy is absorbed, a substantial improvement in clarity can be obtained. Not hard to try, if you haven't already. It's the first thing I would try if I had to have my speakers so close to the front wall.
If, from where you sit, there is any of the bottom of the shelf above visible and in front of the baffle of the speaker, you could probably also benefit from absorption there - it wouldn't take much to effect a big improvement. In both cases, if an improvement results you might want to source a small amount of acoustic foam for the permanent fix.
Finally, before you consider yourself done with your toe-in experiments, make sure you hear what it sounds like when the axes are crossed in front of you. More and more serious listeners are ending up with this arrangement and, for once, theory lines up with practice - logically it should work! Also, I dare say most speakers actually sound just a bit better a little off axis than on. Look how many times an anomaly in one of John Atkinson's on-axis frequency response graphs is exactly compensated when you look at the slightly off-axis response on the horizontal dispersion graph. That is, the response is actually flatter just that little bit (5º) off axis.
As always, if you have the ability, check your progress with a mono signal - the tighter the mono image, the better the stereo.
Russell
