I want to brew 6 gallons of pilsner, but my setup is for 3 gallon batches so I'm thinking brew a 1.096 3 gallon batch and dilute it to 6 gallons at 1.048. My question: If the IBU level in the 3 gallon at 1.096 is 40 would it still be 40 in the 6 gallons at 1.048, or would it be 20?