I have an acoustic with .012 strings. Seagull s6.

I can form the chord fine so there is no issues with barre power. The problem is accuracy when I have to do a fast change. I've been mainly changing from A to Bm and G to Bm but the issue is from all chords to Bm or any barre chord.

My max change speed with metronome has been about 80bpm.

It's strange when I play a song it makes my change slower or more inaccurate. In a good day I may be able to make couple of good changes on that 80bpm speed. Maybe the strumming somehow mess things up. I think my strumming is mainly effortless or I don't think that while I play too much. Or maybe this is somekind of mental issue. I try to visualize the Bm chord everytime before the change.

I'm at a stage where I still have to look on the fretboard when I form chords. Well not always but most of the time. Few easy chords are "no look" level stuff.

Just tried a simple exercise with metronome between a and bm. Just 4 down strums and change. It is still clean at 90bpm most of the changes.

Thanks for your replies.