You also might want to check the distance from the chainplates to the masthead on each tack, using something like a spare halyard. They should be the same distance away, but it sounds like it may not be the case on your boat.
One other thing that could be causing it is a badly calibrated wind instrument. If it is off by two or three degrees, on one tack you'd be sailing 35 degrees off the wind and pinching, and on the other you could be sailing 40 degrees off the wind, and that could make a that much difference.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.