6'4" here.
Couple things before i get to my set up. Pro riders Burandt (maybe 6 foot) Adams (well under 6 feet), rasmussen (well under 6 feet) have bar set ups for their respective height, arm length, etc. There is a reason they run shorter bars.
Riding shorter bars for alot of people results in hunched backs which can lead to various problems. Riding taller bars for alot of people can result in standing up too tall, elbows too high and can lead to various problems. Most of these the end result is fatigue, tired and worn out muscles that lead to mistakes and wrecked sleds. A lot of people have bars that are too wide for their shoulder width and the end result is fatigue, tired and worn out muscles that lead to mistakes and wrecked sleds.
To simply change bars because some pro says shorter gives you better leverage is pretty naive IMO. Shorter bars for people like me (taller), force me to hunch over and actually redistributes weight DOWNHILL to grab the bar. How is that helping me sidehill and get leverage? Too tall of bars and I have to extend too far into the hill to get the leverage i need to pull it over. How is that helping me sidehill and get leverage? Do you see what I am getting at?
There are so many options for bars, heights, and WIDTH (just as important) that you can easily customize the experience for you personally.
I ended up going to Dan Adams Fly bars, with a 2" riser (puts me about .75" above stock pro tapers). I also narrowed the bars about 1" from stock pro taper width. The end result for me was a comfortable fit that allowed good leverage while not having to reach down hill for bar, or being too far into the hill.