When climbing a hill while flooring i notice some hesitation. Is this surging? Possibly DV/BPV?...
 

The spark plugs are fine and it does it in mostly the higher gears. (I think)

Sure, if it's leaking boost. Which do you have?

Stock. This is why I'm asking. Could it be leaking boost without making a noise? 710N will help?

You will usually hear a slight noise when you lift off the throttle, mostly you will hear noise if
 

you have a cut in a hose. Either way the 710N will help over the stock DV/BPV.<ul><li><a href="http://www.ttstuff.com/Merchant2/merchant.mv?Screen=PROD&amp;Product_Code=OEMDV710N ">OEM Diverter Valve (DV) - 710 N</a></li></ul>