Gearing help and advice please

My engine is a p200 with standard gearing and a mallossi 210 kit fitted, it also has a flowed crank, matched transfer ports on the casings a si 24mm carb with a sip road2 exhaust.

pretty average i know but im finding it too revvy for my liking and would like your advise on the most cost effective and easiest way of giving me a little more top end without loosing the ability of holding the speed in 4th gear too much.

It was metioned to me that DRT do a 24 tooth clutch gear cog for £40 that will do the trick.

If any one can help im all ears.

thank you in advance...