You know... I'm going to throw a bit of a curve ball here. I was having the same trouble with F major.

Then in a total separate situation, i had wanted to adjust the neck on my guitar. I had noticed that the action was higher than I wanted. Also the action was higher at the bridge than the neck.

After adjusting the action on my guitar and changing strings, I noticed that I was able to play F major with less strain. It was just much easier to get all note clean rather than mush.

So I guess what I'm suggesting is, it may be worth taking your guitar to a tech and have them check it out, it may not be setup to it's optimal possibilities.

Good luck. And yes, I feel your pain on that chord. I don't have long fingers, so I'm finding some of this to be a challenge.