Johnkpap,

You did nswer my post but the question wasn't for me I read.
It is a situation in which I can help you so I give you my opinion.

When the movement of the connection rod between the bell cranks is less, as I can see on the picture and you write it, there is only one important solution to use, try to find a bigger servo lever.
Very important to reduce the play.
Next step, bellcranks no gain and no reduction, 1:1
Levers on the ailerons to adjust the throw but never to short.
It has also to do with vibrations later during flights.
The more movement of the connection rods the less forces!
If any reduction is needed you can reduce the throw on the bellcranks for example 1 : 0,8

Easiest way to have the best result.
I keep my answer short but when there are questions Of course I will answer them.

Cees