I remembered to log in.
"Then haul it out again and self-edit before sending off to a crit group."
Sending it off to the crit group for what? Expectations should be that you will learn something about the story, yes? What works and what doesn't work, that sort of thing. But, then, you are going to tell us two sentences later "Pick out the ideas and obvious flaws that resonate with you from the crit group (be selective) change it,..."
Okay, you can agree or disagree with the crit group feedback. If you are going to go with only that which resonates, then what was it again that you wanted from the crit group? It seems to me that you like or don't like the story you've written and the crit group can either support or not support your already chosen position. If the don't support, then their crits probably won't resonate with you and you can safely ignore them. Why are we sending it to a crit group?
"...then, if you still think it has potential, send to a professional editor..."
Why? What is it that you expect to obtain from the professional editor? I'm not talking grammar and spelling, here; should I be? I get the impression that a professional editor does more than dot the i's and cross the t's. They talk about what they think works and doesn't work, the same sort of thing that that crit groups advertise as their raison d' etre and what I think the the publisher's agent(editor) is supposed to do. Is this accurate or not?