I have cut many sheet cards, whether older Wheaties cards or later 1970’s Topps. I have had nearly 300 of these cut cards graded by PSA, although none in the past 2 years (again, maybe a crapshoot with PSA currently). From prior experience, as JollyElm noted, my recommendation would be to use a straight-edge and cutter (I certainly prefer the wheel blades over x-acto for perfect cuts) and just “barely” trim your lines to make them parallel to the dashes. You do not need to cut close to the dashes, just straighten the lines for those graders looking for “eye-appeal”.
Dave
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