ok i know this is for stock but maybe of some use.
i used to ride a onza t raptor bar and stem on my zoo boa. Felt great and everything but they started flexing bad so i thought time for a new bar and stem. Got ma self a echo bar and stem combo really really low in comparison. They felt pretty gay to be honest.. my bike felt a mile shorter.. i cant gap anywhere near what i used to just.. everything went gay i felt like i was going to go over the front because to compensate for the lack of distance id try to lower the front lower and lower and just couldnt get the power through.
Apart from maybe wheel swapping, started to get better at that. oh and i couldnt surge at all i just couldnt pull the front end up quick enough. See my bike in general felt like a dead dog in a bath. So i thought id try a little test and got me a monty bar and stem. Ive been using them for 2 weeks now and im in love. Cant fault them at all really it just made my bike feel how it should again.. my gapping is still shocking.. since i still have a wank technique from the echo bar and stem. Higher rise on the front all the way. The lower bar and stems are useless for me.
in my opinion it could all be personal preference, techniques, style, experience. But for me the switch back has worked