Does it get better, yeah it will.
I was having a lot of issues not passing but then all of a sudden about a month agoI started passing o_O Like, very often, even when I was, IMO acting feminine. I think it has something to do with my sunglasses. Females have softer eyes. It doesn't matter for the most part who you look at, most FTM's retain their 'female eyes'
My example seen here;

Mr. Sexy Pants up there has the body of a friggin god, but he still have soft, soft eyes. If I saw him in passing and didn't KNOW, I probably wouldn't misgender him, but if I stood and had a conversation with him (I'm one of those near constant eye contact talkers lol) chances are i'd notice how soft his eyes look.
It's a curse, but it's also nice! I trust a guy with a soft eye over a hard one. Easiest way to avoid it? Sunglasses. Also as others have said, a rounder face is more associated as a feminine feature, so as you continue to loose weight you're face should square up more and that will also help! For now, it's nice out, go pick out some sunglasses is my advice.
I'm also personally pay lots of attention to the mannerisms of men. Yesterday when I went to pick up my T I saw another trans-man who was so distinctly male I did a double take on him. Mostly because of how he walked and stood. He screamed cis-male because of these mannerisms. I try to make sure I use certain mannerisms, but nothing like that dude. Anyways, rounder face, soft female eyes and subtle non-verbal behaviorism can cause misgendering.