Aftermarket throttle cable

For those who are using an aftermarket throttle cable like Lokar...how long did you make it and how did you route it? I'm having a problem that I can only get 1/2 throttle opening. When I observe it, it appears that the cable is flexing some before it begins to pull on the carb. I've taken all the slack out and still have this problem.

This is on a 360 in a Duster.