There is ZERO chance you could ride a mini 60cm. You are still 50+ mm over the TT on the 63 size. The biggest frames tend to have stems of 110 or 120, bloody hell IMO. The WB is still only 1086, barely adequate. Bike companies all laughably over estimate TT clearance needed.
I'm 5'8" and could almost ride the 826 standover of the 60. I've had 4 bikes with 58 cm.
They fit me perfect. My custom has 611 eff TT. I use comfort bars with 70d sweep and long grips.