I get a lot of mixes with exaggerated width. I assume they were mixed on headphones most of the time. I'm digging my M/S Barry Porter EQ. It's like having 1.5 EQ's. I could only do M/S ITB before so it was much less easy to use. Boost mid, cut side.
That's great, I'm glad you're digging the M/S on the Porter EQ, probably takes less than half the time as before. Also nice that you're getting more and more use out of 'Shaker'.
Edit insert: Yes, getting width as you want can be a learning curve on headphones.
There are a few classical recording engineers who have occasionally only been able to use phones on site, and also mixed the whole thing live to stereo. I suppose some TV would have to be that way too. That's pretty good skills.
Re. your earlier post - I've had AKG 240's, as have lots of folks of course. They're a proven tool, and if they allow you to do what you need on them, I can attest that they're 'shop-proof'. I abused mine almost to the point of it being a war crime. You can't really go wrong for the price.