im a male alter (though the body is afab) but i love having a feminine body, am i still transmasc?

Of course yeah, gender expression doesn't equate to gender identity, you can identify however you want.

I'm amab and on feminising HRT, and I have a masc-presenting headmate that prefers wearing a binder but very much identifies as feminine. I think the best part of being trans and plural is getting to do a kickflip with gender.

Of course!

I'm nonbinary in almost the opposite way, amab and on feminizing hormone therapy but keeping parts of my masculine presentation.

I'd say this is different from a typical 'transmasc' experience.

i don’t really feel like a girl as a gender but i feel really good in a feminine body.

Sounds like you might be GNC female? Ultimately it's up to you to decide what terminology is right for you, but as a trans guy myself, I personally really do not relate to loving/wanting to have a feminine body, if anything the thought is a little triggering. We're not all the same though.

Be true to yourself first. Gender is a social construct that's only really useful to help explain in conversation, but that is it.

Isn't that just a femboy?