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with weight loss ,i believe the greater the distance from the axis of a rotating part , the more benefit. meaning, weight removal at the tire will make more difference than an equal amount at the spool, brakes or axles.

So it could be possible that the tire weight is part of the reason were having a slow to rev problem in high gear between 6500 & 7000 rpm with the 34lbs heavyer tire ?



Not likely. I'd look for another cause. Once you get the tires turning they actually act like flywheels between gear changes. The momentum of the tires actually helps get you through the change. Your biggest gain will be in the first part of the track when switching to lighter tires/wheels.