The symptoms you are describing seem to indicate friction somewhere in the system. Did you replace ALL of the shift housing runs, including under the bar tape and the last run going into the derailleur? I would suggest solvent cleaning and relubricating the derailleur. Check the shifting action by pulling on an exposed run of shift wire and see if there is still sluggish response moving to the small cogs; if so there is still excess friction somewhere. A remote possibility is a weak return spring, but unless it is heavily corroded that is unlikely, or the shifter is not paying out cable correctly; the wire pull test should diagnose this.
Also, if the hanger was bent it is possible that the derailleur has gotten damaged as well.