Plans for the races this weekend.

Current Setup:

GO 3-port sport w/ JP-3 running Nitro Juice 30%.

Tomorrow I'm going to replace the JP-3 with a Dynamite 007, tune on the 30%. I only have 1/2 gallon of 30% left so I'm going to gauge performance and fuel economy based on the pipe being the only thing changed. When the 30% is gone I'm switching to Rocket Science 25% and sticking with it.

New Setup:
GO 3-port sport w/ Dynamite 007 running Rocket Science 25%. Since I'm changing the fuel from 30% to 25% on race day what do you lot think I'll need to do to get the tune right? What do you normally need to do when changing nitro content?