I'm thinking of getting a 16t freewheel, especially as everyone seems to be liking the bigger courts and my legs are mega powerful these days, I was spinning out a little on the bigger than I'm used to LO courts last year. Would take me from a tiny 40.34GI to a massive 42.86GI, I'm sure the difference will be breathtaking.
But that would mean I could jump 9 places with a new freewheel, it would be foolish not to buy it now.
Get yourself some proper chainrings.