Get a 17 tooth cog. This will give you a lot more skid patches and make that one hill a bit easier.

I have the Dawes SST and I changed out the 16 tooth freewheel for a 18 to spare my knees on the hills. I spin out quicker, but I need to work on my spin anyway.

I went the opposite way with the drivetrain. My new freewheel is 3/32 so I got a 3/32 chain.