racerdx6,
Get another TC3. It is still the best TC platform for stock foam. If you race mod, then the Losi XXX-S would be another very good choice. Make sure you get a Factory Team if you get another TC3, well worth it.
Running heavier oil like 70 wt would not only make the car easier to drive but also improve your laps times significantly. The 40 wt is too reactive and the car grips too much in the corners, which means it looses speed. Try running 70 oil front, 60 rear, Yellow springs up front, Purple rear. Rear toe is good, but set your front toe to 0 man, that'll help. Your tire choices are fine, too.
If i were you i'd just pick up a brand new Factory team TC3. There are many of us who can help you here with setup once you get it.