I would stay with what you have first and see if you like it. A lot of the guys that run thick center fluid use motor brakes, it helps prevent unloading during braking. I run my 8T race roller with the Tekno conversion setup as it came out of the box and it feels spot on.
Thanks for the advice guy's, I shall be using the mechanical brakes as this was the main reason I went with the Tekno conversion to retain the stock brakes.
Losi 8T RR - Novarossi Plus 21-5BT/ Jammin JP3 - Teknorc 8T - Neu 1515-1Y - MGM 16025-3 Z Series ESC.