It's about a 7%+
reduction in circumference, rolling diameter, & rpms
increase at a given cruise speed, and of course the speedo error.
You might noodle around on some tire joint sites and look for a "bigger tire", eg "285/45R" that will come closer to the orig rolling
specs, but with that "wider look/footprint" you seem to be after.
As for the lower aspect ratio "improving the handling", there are pages of opins on Google, some of which go against the
Conventional Wisdom of wider, lower aspect tires equals better handling, fwiw.
GL,mD
Good tire size change checker sites:
Tire size calculator
Tire Size Calculator - tire & wheel plus sizing
Good Wheel Offset and new Tire Size Comparo Site:
Wheel / tire size calculator / comparer - BIGCUSTOMWHEELS