I've recently gone the rear sprocket route, reduced to 41T and left the front sprocket at 14T.
It's changed the bike to suit my riding style, less revvy at motorway speeds and will sit at 70 all day. I'm a heavy rider and it copes with this gearing with ease.
I now find the Inazuma more than adequate for my needs, round town and a 90 mile round trip commute. It still sips fuel too.