Ts1 gearing

Hi, currently running Indian gp 200 gearing with 46x19 sprockets giving a 4.84 4th gear ratio, coupled with this is a 30mm dellorto carb & a bgm clubman ,this set-up runs great uphill ,against headwinds etc but im thinking of trying 47x20 to give me a 4.70 4th gear ratio . my question is I'm i best leaving as is or are other people running this set-up successfully with no drop's in performance? many thanks for any info
al
