TBH, without re-working the choreography, there was nothing much Aston could do to change his dance.
As others have said, he had too much rise and fall so he could have worked on that.
But I think the judges shoot themselves in the foot when they criticise the choreography; obviously that's not up to the sleb, so when it comes to the dance-off they have to try to find 'reasons' for who they save that are about the dancing rather than about the choreography/theme.
Having said that, Mollie danced very well indeed in the dance-off and was the right choice IMO. And I'm no fan of her or AJ.
I do like Shirley but I agree with this: Karen Hardy should be on the panel IMO. She’s got the knowledge, won the show and has loads of personality. I've said for years that Karen would be the natural choice for head judge.