Your pinky is regularly held in abduction/opposition. This indicates that your hypothenar muscles are under constant tension. You also appear to have some degree of constant extension at the MCP joints, indicating that your extensor digitorum communis is active.
Fretting a note ballistically isn’t a problem unless the note bends sharp. It’s literally the mechanic of a hammer-on. The “slap” you’re hearing is probably the string ringing between the fret and the nut, which doesn’t matter at all on an electric guitar.
Power and range of motion are good things. The fact that you’re able to generate significant power over larger distances at higher tempos is a good thing.
Notice how in the first handling of the sixes, your entire hand and forearm moves cyclically in time with the pattern. This is necessary for faster playing and synchronisation, and it’s totally absent in the other (inferior) handling.