Where I found the Integy knuckles binding a bit was on the front C hub under the ball stud. I clearanced the C hubs a bit around the bushing so that the ball stud would rest on the bushing instead of the C hub and that took care of the binding.
I've never heard of a book dedicated to the TC5. Hudy has a tuning book that has tuning principles that can be applied generically to RC touring cars. It comes with their 1/10 TC setup kit and can be downloaded for free here:
http://www.teamxray.com/teamxray/pro...030822fe32a83b
Having a decent setup station really helps with TC racing since really small adjustments can have a noticeable effect on their handling. Hudy makes the best to me but Integy has one that is a lot more affordable. The Hudy 1/10 kit costs about the same as a TC5r but comes in a nice Aluminum carrying case and will last for many years.
Even left to right balance is also critical to touring cars. I'm not sure if the first generation TC5 kits had them but on the TC5r and TC5f there are holes on the centre line at the front and rear of the chassis that allow you to put the car on balancing pins (Hudy sells them for about $10) that will let you know which side of the car is heavier so you can stick weights on the other side until the car is sitting level on the balancing pins. Moving the Lipo pack further out on the chassis can help with this. Diggity designs has nice plates that allow easy mounting of lipos further out so you don't have to add so many weights to the car.
There is a lot of info in this thread and another one here
http://www.rctech.net/forum/electric...ps-tricks.html
If you have a lot of time you can read all the posts but the most recent info to do with the TC5r and TC5f would be in the last 1-2 years I think.