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Is your bow arm in full extension with the nocking point you describe or do you have it slightly bent?
I can't say for sure with out a visual but it sounds like your ok to me. I hook my thumb around the back of my neck and my Knuckles are just below my ear.
If anyone here is having a difficult time with their set-up and doesn't have a "go to" place for in person answers, for a compound bow, "The Nock Point" in MountLake Terrace will be a good visit.