After reading lots of recent posts on here in various threads, about gearing, I'm going with 2 teeth more on the front and 2 teeth less on the rear.
I've mentioned this is another post, but every bike I've owned, except for my Aprilia RSV, has felt very under-geared, especially my old KH 250. So, on every one of these bikes I've ended up going with 1 tooth more on the front and 2 teeth less on the back.
This has meant that I've never had to move move the wheel forward, or use a longer chain and in every case it's resulted in a much better cruising "feeling" and better economy. Riders for a long time have wanted instant acceleration at the touch of the throttle from a cruising speed in top gear, so manufacturers have geared the bikes as standard to cater for this as much as possible/practical - everything's a compromise.
Anyway, sprockets are cheap, so give it a try - just remember, old/stretched chain and new sprockets don't go well together (neither does a new chain on old worn sprockets).