[Water Warrior 2]

Sounds good to me. Longer lower gears are nice around town and in lessly populated areas. A slight incline at your speeds will bog down the engine in 5th but that is small potatoes in the grand scheme of things. That is why 4th gear is there. Most folks try regearing once at least.
I regeared a dirt bike to go slower way back when. My 650 Vstrom has an added tooth up front and is very nice to toddle around town. However I don't often get into 6th gear on the highway as it is pretty fast if I want to maintain the lower part of the power band. This applies to my local roads. Out on the prairies with a higher speed limit the bike in 6th is happy and so am I. I do have a personal limit for top speed though. An indicated 140 kph(87 mph) is an actual speed of 81 mph and that is plenty fast for my thrill factor.