Replacing grout with silicone in shower : HomeImprovement

I’m looking for a little confirmation here…

My master bathroom’s tiled shower has cracks in the grout where the different planes meet. I’m in the process of removing the grout in the corners using a dremel. My plan is to caulk 100% silicone where the old grout used to be in the corners so the flexing of the house won’t cause the grout to crack again.

I’ve made some good headway on removing the grout but i’m not sure if i need to remove all of it where i’m going to be caulking or if shaving ~1/8″ off it so it’s recessed below the tile would be enough to caulk over. I’m going to scrub the area with acetone before caulking so it will hopefully adhere as well as possible.

I’m afraid to go too deep with dremel in fear of damaging what’s on the other side. Here are some close ups of part of what i’ve done. Some it falls out in clean chunks while other parts i’m just grinding down.

Am I on the right track? Should shaving the 1/8″ off suffice or should i really be aiming to get all of it out before caulk?

Any advice would be much appreciated.

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