Hopefully the self contained robot cleaner is removing the bulk of it. I'll manually vac as well and do a backwash after I'm done slamming.Ok.
If you vacuum up the carbonate scale you will, at the very least, need to backwash after that. That calcium scale is acting as a source of alkalinity that is keeping your acid demand high. You want to get rid of it as much as possible.
The other way to get rid of it is to drop your pH and keep it as low as possible and then it will start to dissolve. However, that means you will be putting that calcium back into solution.
My preference would be to get it out of the water but it's up to you.