Blade grips on the new Titan 50 SE have the hex shape on both sides of the grips. This is because on the older Raptors, you had negative delta inputs (link on trailing edge of blade) but positive delta (link on leading edge of blade) on the new one. You would notice that if you had installed the blade grip wrong, then one blade would be positive pitch while the other would be negative. I had a brand new set of CY 600 carbon blades that balanced perfect but still had tracking problems. Put one blade parallel to the tail boom while 0 deg pitch, push blade tip towards tail boom and measure deflection. Do the same with the other. Check that both "flex" the same. Otherwise, pick the heli up by the blade tips and see if one blade bends more. Another thing maybe is to see if the "old" blade grip rotor bolt hole is not elongated (oval), this will also cause tracking problems.

Regards,
Gavin