Stick with the stock rear tyre. You will find a boarder tyre will drag down speed, & make the cornering a bit lousy.
I have a '97 Yamaha YZF 600 with 160 in width which I stick with, while the Honda 929 & 954 are stock with 190, but reduce then to 180 again for better cornering.
Will admit when the rear tyre had woren out on the 600r I had in stock a 170 for a GSXR-750 & had sold. Put on the 170 since mine has a broader wheel. That is when I noted the bike did not handle as well & once that wore out I shifted back to stock.
Check on prices & you will find one size up often means a bit more money, but not longer life.