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I did wonder about those old bars if the tops/ramps are supposed to be used more. I don't mind the levers for the most part, but it's a little too lumpy when I'm tired and braking from the tops is pretty difficult.
The twitchyness was still there with a bag (and lock) on the front, but less than unloaded. Shimmies horribly if I let go downhill on the way to work sometimes.
What do you mean about the h-limiter? How will that stop the chain flicking off the top of the chainring?
Ride with a handlebar bag on?
Mine's always twitchy, but because I always have a handlebar bag on, it's not really noticable.
I get what you mean by the brake levers, it never work on bicycle with compact drop, as the compact drop is designed for the long reach of the modern levers, old style handlebar were designed to ride with your hand on the bar, not the brake levers, like this;
As for the chain dropping, very stupid question but have you adjusted the H limiter on the derailleur?