I'm not too keen on the idea of the weaker clips needing to be squeezed/readjusted after they've seen a fair bit of use.
I think it would be better to try to adjust the current clips so that they're not hanging on so tight.
I wonder if it would be possible to find something that is just the right size to insert into each clip to stretch them enough but not too much? It's a bit hard to describe what I'm thinking of so maybe I should do a sketch, but I'm thinking of something like some mild steel that is rounded at the bottom, but then goes to straight vertical edges - so that it's relatively easy to insert but so that the clips don't close around it and make it hard to remove. A hole could be drilled and tapped so that a rod could be screwed in with a handle on the end. It would be a bit of a pain to make something like this, but it'd be easier than trying to manually stretch each clip just the right amount. Probably the hardest bit would be working out the right size to do the job.
Let me know if you'd like me to sketch it up for you...