#1
I;ve got F major/F minor and bmajor and b minor chords down but i cant seem to play F7--- either the d or b string is muted when i try to shift finger to accodomate (i still cant full barre all 6 strings with my finger, should i first try to perfect that or just keep on trying to play all the barre chords)?
#3
You'll never improve unless you work on your weaknesses. Sounds like this is an issue with hand strength, not just fingering. Work on that and the correct fingering will come with practice. So will hand strength, but you can do exercises outside of guitar to address that, like using a Gripmaster or squeezing a tennis ball. You gotta be able to do that full bar with your index finger.