Thanks for the tip. I'll give it a try.
I own, and use, the same plane. I suspect there is a rise just in front of the mouth, when the blade is wedged. Set the cap iron and wedge tightly, just short of taking a cut. Lightly flatten the sole on sand paper on a reference plate. The wedge assembly exerts considerable force at the mouth. See also setting a cap iron. https://www.theenglishwoodworker.com...-plane-review/