Tailwheel leaf spring

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What is the correct Tailwheel leaf spring for the Eagle?
I have a 45 degree API Tailwheel and am trying to get the castor angle correct. Right now it is still too far forward even after I put a rubber pad in between the leaf and the fuselage. Im wondering if my leafspring is incorrect, which is a J3 spring.
My next fix is to remove the rubber pad I installed and use a 20 degree API Tailwheel hoping that the Tailwheel doesn’t castor reward too much. Any thoughts?
Thanks,
Ethan

 

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