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A worn timing belt or chain can have enough play that it effects performance. Same with valve clearances, do you adjust the valves on this model?
Id try jacking each corner and spinning the wheel by hand. Maybe a stuck calibrator or wheel bearing going bad.
Brake shoes drag if they are pretensioned too tight. It gives good brake response, but drags 24x7. Making them looser gives more petal travel, but dont drag.
Plan b, instead of lowering, add an air dam, lawn edge strip bottom of bumper.
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