Airkewld offers a throttle cable tube with a roller on the end just for mitigating off-angle issues like yours. Here's a link to their product:
https://www.airkewld.com/Bille...ttle-Tube-p/8013.htm
I have a coil spring between the fan shroud tube and the throttle arm on the hex linkage so it pushes the throttle/hex arm back out when you release the gas pedal, pulling everything back to zero. It is just a spring from my local ACE hardware store:
I also seem to have a cable approach angle similar to yours but with enough oomph to the spring it has never been a problem.