LDL 40-50 is a very good range to prevent further buildup. It doesn't need to be zero.

It's becoming more common to add 10mg ezetimibe to a statin, rather than increase the dose. You get more of a boost with ezetimibe than you do with the higher dose.

There is nothing you can really do for calcified plaque. Calcium scores generally don't go down.

I think it's a very good idea to discuss with a cardiologist, in person.