The switch units clamp up tight enough on the bars if you nip the locating lug off. This is my preference as it can take several attempts to find the ideal position for the bars let alone the switchgear. If the units are too loose for your liking with the lug removed you can always wrap a bit of tape round the bars, tighten the switch units up and trim the tape off the sides, though I've not had to do this.
I personally like the wider bars, for me they make the bike feel more imposing and significantly improve counter-steering. I can't see any benefit to making them shorter I suspect your knees and elbows would be the limiting factor in filtering through traffic rather than the bars, but I'm a lanky git so YMMV.