Lokar cable set Slant 4 barrel 64 Dart

I have my go to mechanic working on my Lokar cable set because I was not happy with my install. He is having trouble getting my Quikfuel 450 to open to full throttle because of the Lokar cable geometry. I am trying to come up with a solution because he is only able to get slightly more than half throttle with the Lokar set. Would a throttle lever extension correct this problem?