Mind you, it's possible that the EWP is freeing up alot of grunt at 70 with that much ram air going over the rad - it's hardly working at all whereas the mech pump is gulping down quite a few horses!
Hey,
No matter how much power you find revs and speed will always be the same in each gear (clutch slip not withstanding) unless you change a drivetrain component.
More power just means you'll get to those revs and speed faster.