Rock in A minor (variant) — syncopated muted strums
As with F on the catalogue's barre chord grid in C, the barre here needs to stay firm rather than ease off to mute cleanly — a constraint the syncopation makes even more demanding, since no dead time lets you check the barre's grip between hits.
Tips
If simple muting on F isn't reliable yet on this grid, work on it in isolation first.
Keep the barre finger firmly in place throughout the syncopated pattern, without trying to ease it.
On Am, C and G, the palm does all the work with no barre constraint: consciously contrast that with F.
Chord progression — Am
Bar 1
Am
i
Bar 2
F
VI
Bar 3
C
III
Bar 4
G
VII