Martha crabapple flavor

I got some Martha crabapple scions from the Home Orchard Society scion fair a few years ago and grafted them into my aronia bush. THey fruited but were bitter. THen I got some more this year and they were still very bitter. Has anyone else around here grown Martha crab and was the taste bitter? I wonder if the scion was mislabeled. I have tasted other pears and apples that I grafted onto aronia and it didn’t affect their flavor.
John S
PDX OR

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