I have 16†and I’m starting to get the feeling they look to small!!

Two ways I could combat this is;
Obviously upgrade to 17â€Â
OR
Go lower than the already 60mm
I really like my current 16†BBS and don’t really want to get rid, would prefer to go lower!!
Any thoughts/recommendations/advice as to going lower than 60mm or is it better to upgrade to 17â€Â