Good to see your opening ranges growing!
As a regular at the 4NL cash tables l see a lot of players playing far too many hands. I generally open 15 to 20% of hands overall, opening wider from cutoff and button. I will also flat some hands from cutoff and button. This has given me a decent winrate at this level.
So 16% is a step forward - also try to study some 6max cash preflop ranges between sessions.
Good luck at the tables (unless you're on my table!)