Ackermann compensation for tadpole trikes- how to work Peter Eland's spreadsheets
The story about pointing to the center of the rear axle is valid but sometimes you have to set the ackermann a bit of in the positive or negative direction. In my setup the full ackermann works fine.

You might be able to solve your problem by making an animation of the setup so you can see the angle that the wheels are making when you turn the handlebar. I tried but I did not succeed in it.