How many crossovers/reviews to get the bump

What is the most attempts you have done trying for a grade bump on a crossover or review? What card were you resubmitting? What about trimmed cards eventually coming back as untrimmed?
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Seeking primarily PSA graded pre-war "type" cards
My PSA Registry Sets
34 Goudey, 75 Topps Mini, Hall of Fame Complete Set, 1985 Topps Tiffany, Hall of Fame Players Complete Set