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How long is your inner barrel? If it's more than around 300mm, ditch that heavy weight on the wasp. Try going as light as possible on the piston and see what happens. You already seemed to gain fps by going to the medium weight, try to go lighter now.

The heavy piston weights are for very short (<300mm) inner barrels and very heavy (<0.45g) bb weights. Otherwise you aren't volumed correctly and you'll be losing a lot of energy to that ineffeciency.
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