Sweet cherry grafted to Romance

My Romance bush cherries produced over 35 gallons of cherries this year. There are lots of suckers. My three sweet cherry trees have produced 2 quarts of cherries total in 12-14 years, plus are too tall to net easily. Has anyone tried grafting Lapins or Kristin to any of the Romance cherries? It vaguely seems I heard sweet and sour are not compatible, but I might be mistaken.

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i grafted 2 z4 rated cherries to my monty. both took. think kristen is one. dont remember the name of the other. montys parents were half sweet cherry.