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When you switch the ETC to Power mode, the transmission keep the lower gear to the max RPM allowable then switch to the next higher gear. That's what you experiencing.
An ECU reset (disconnect battery for 15 minutes or do the key ignition sequence (posted on this forum)) will clear the computer memory and your/previous owners driving style. Then hit the switch and check out the difference. I do an ECU reset every 3 months or so. Also I recommend cleaning out the throttle body every 3 months too. The performance and response is much different. ps. I also own the SprintBooster Electronic Throttle Control, only use it for stop light racing.