Wiesco Piston, Mentor, Ohio, manufactures a reverse dome unit that maintains OEM compression/weight.
FWIW, 8 lbs of cast iron(4 per hole) is removed when performing that work.
Most folks make mention of smoother running, once that upgrade is established. 
Scott
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"If a street Harley doesn't have torque, how much horsepower it makes, simply does not matter."
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