Hey dude, If I understand you correctly your sayin in power mode the auto is holding gear at ~4700 instead of shifting and/or heading to red-line.
This being the case my guess would be your auto needs fluid and/or the bands replaced. Not reaching the redline is probably just due to lack of servicing seeing as you just bought it IE: needs plugs, air filter, injectors etc.
Hope this helps a little
Matthius