If I had to guess, it might be somewhat more exaggerated on my low-trail bike, which has twitchier steering, but the feel-like-I'm-endoing thing is every drop-bar bike I've ever ridden. And my weight distribution is a LITTLE weird (shortish legrs, long torso), but nothing crazy. So I'm thinking it's a matter of comfort / familiarity? But I'm able to get in the drops for extended periods of time ducking under wind on flats.