I am a one bike person. I cannot afford the time and hassle of taking care of more than one bike. I am using a TSR27 and it fits my needs very well. I can store it my small car's trunk, it has a wide gear range which I need to climb hills, it rides very well on roads (I am using Kojak tires) as well as on moderate dirt roads, it is stiff like hell and with the day bag I can carry road tools, camera, food and still have spare room.
Like you I micro adjusted it and I can not think of any other modification. All is left for me to do now is to keep those pedal turning.
I also have a DualDrive NWT laying around but I am not using it anymore. I plan to sell it or if I will not find a buyer, to trade for a super folder (Tikit, Brompton, Strida, etc).