No need to go larger, just better tyres, hero blobs, and footpegs with blobs removed touch down with the standard size!
U do look a bit Stiggy-ish there bud ....but nice lean.....wish i could do that :-)
The best tyres to go for are Pirelli supercorsas. Look on eBay go for a 120 front and 160 rear you will not believe the difference they make. I have done 5 tracks days on the same set and they are awesome, so much so I have started to hit the generator cover on fast left handers. I have another day booked at Bedford autodrome on the 25th and can't wait. You will need to make some jack up plates for you foot pegs though.