Parallel to the link has nothing to do with it. If your resolution is poor you can spend all day putting it in different positions. The problem is your resolution plain and simple.

You only need a throttle curve if you have poor geometry or a peaky pipe (thats a whole other story - can be adjusted differnetly). Spend some time fixing that and a throttle curve isn't as magical as it may seem.

The correct answer is in my original post on the topic - Longer arm on the carb and shorter arm on the servo, end points both 100% or better and pref. within 10% of eachother.


Edit:

ReReading this I am not understanding your reference to being parallel? Can't you just open the hole in the firewall to allow for some side to side movement? A picture would be worth....