Yeah, if they're Kolinsky sable, the material itself is top of the line. Take good care of them, and they should last a good long while, and maintain their shape.
I didn't use to use it, but I do recommend using a brush soap. You can go all out and get a product made for the art & hobby trade, or you could use saddle soap. But it's a good idea to use something to help preserve the bristles, after you clean the brush. I know a painter from France who actually uses olive oil to coat his brushes after he cleans them. I used to rub my thumb and forefinger on my nose, to pick up skin oil, and then rub that onto the bristles.
Remember that the bristles are hair, and hair has natural oils that protect the fiber. After using a solvent to remove the paint, apply the soap or whatever you choose to use, shape the point, and it should keep a point for many years.
Also, for water-based acrylics, I recommend trying a wet palette. As a trial, you can make your own, from an airtight container, a sponge, and a piece of kitchen parchment or brown packaging paper. I made one for myself, when I first started using a wet palette.
You just soak the sponge, put the paper over it and let it soak up water, then put dabs of paint on this palette. It makes it easy to keep the paint at a good consistency, and to blend colors, if you're doing that. Also, you can use a batch of paints over several sessions, as necessary; the palette will keep the paint "fresh". If you like working with it, then you could consider moving to a commercial palette.
I use mine with all my water-based acrylics, from Andrea and Vallejo, to craft store brands American, Apple Barrel, and Folk Art.