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Don’t worry, this is perfectly normal! You are approaching things the right way, the 3 string version is perfectly fine (you want to try and not play the High E string if you aren’t able to turn it into an F.
It probably took me about 14 months to get to where I am now which is about 75%. To explain what that means: if I have a second to set it up and can play the F mini clearly. Depending on where I’m transitioning in from I’ll hit it clean some of the time. Other times the B or E string might be partially muted, not a clear ring.
I’ve written plenty here in the forums about this chord. I’ll search for some of guidance I’ve given in the past and post it below. Maybe something in there is helpful.