I’d think it has more to do with eliminating toe in than the half inch one speaker is now closer to the side wall. You could simply just toe them in again in their current positions and see what happens, and my guess is the disappearing act will once again be decreased.
So, of course, after a hard day’s work, I had nothing better to do than futz around with speaker placement. After some trial and error, I found that my speakers (JA Pulsars non-graphene) work best when pointed straight ahead with no toe-in. When placing them, I inadvertently put the left speaker about 1/2" closer to the side wall than the right speaker. They were previously exactly the same distance from each side wall. With this new, slightly unequal placement, the speakers completely disappear. This was confirmed by my wife who, without any prompting, told me that the music now seems to be coming from out of nowhere, whereas it was directional previously. I can’t explain this phenomenon ... does 1/2" really make that much of a difference? HEY, turn off your dirty minds.Any opinions would be welcome. Thanks.