I'd use a 32T hacksaw blade and make sure you tape the area you want to cut. That prevents delams.
Make sure you move the controls in on your un-cut bars before you go through all the trouble of cutting down your bars. If it doesn't feel right after you cut, you can't put length back on. Ride it for a little while with the grips and controls moved in to where you want to cut to then decide if it's the best move.
Don't you hate it when a sentence doesn't end the way you think it octopus?
Where I ride it comes down to the width you like descending in treeless terrain and the width required to negotiate tight tree lined single track without bashing your pinkies. I compromise on the side of my pinkies.
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Old enough to know better. And old enough not to care. Best age to be.