Just a thought. The 25, being so sharp, is quite sensitive to the amount of weight you put in it. My mpg and speed/rpms at 7 lbs vacumn go way down when I'm loaded heavy vs a light load. Maybe it can be sensitive to weight in other ways. Sounds like your canyon runs are a heavy load. Could this be related to the handling issue? Again, does it do it just as bad with a light load?
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