Don't know if the TF Kit built is that much different than the ARF but my ARF balances perfectly at the 6-3/8" 162mm from the leading edge, with a Magneto G-62 installed so the prop hub is 6-3/4"  171 mm from the firewall.   No tail or nose weight needed. Did put 2 25ooMAH LIFE batteries way in the back and had to move one battery up between the elevator servos to get it to balance.