The WOP spring tension also serves as the trigger reset. Reduce or increase one you reduce or increase the other. Anything making contact, a trigger guard with the trigger for example, will affect both.
Another factor is the sear. Unlike the trigger WOP spring, the sear torsion spring only serves to reset the sear, however its ability to fully reset can be restricted by making contact with the stock.
One or both of those conditions can cause inconsistent or prevent sear to trigger engagement altogether. If it works without the trigger guard one of two things may be happening. One, the guard is contacting the trigger or two, when the screw is tightened it's flexing the action or pulling it deepen into the inletting causing the sear to make contact with the stock.
Bill
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