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I suspect the drop might be too much and your weight might be pitched too far forward.
I previously had the telescopic and it annoyed. My mate who is 6'4'' initially had the telescopic/'M' set-up and where I 6'3'' then the telescopic might be my friend.I also suspect your dealer is doing their best to satisfy your desired position.
Yes, test ride the flat bar, but just remember you might be comparing 'extended' vs 'telescopic'.I look forward to a pic of the JK mid-rise
I’m 6’5 and use the telescopic seatpost. I do like quite a bit of handlebar drop on my bikes and am quite flexible. Maybe I should go and test the S version before deciding anything. The extra reach would be nice too. I do think that I will just end up buying the JK midrise bar.