If you would always wait for a "recommended" CSP version, then you would wait years. Actually the state "recommended" was done, because many users said, that's a good version. But with the rapid development and high rate of new features, this state is no longer given.
So actually if you don't want to try a "buggy" or "not tested" CSP cersion, then you should quit using it and stay with vanilla AC.
The installation of CSP versions is pretty simple now. In CM goto settings > Custom Shader patch > about&update. Then just click the version you like to try.
I recommend CSP 1.72 or 1.74 for Sol 2.1, or if you are a patreon of Ilja, CSP 1.75preview1, to have the new RainFX Modul working.
So at the end, there will be always some bugs in the extended AC develepment, which became to a big universe, but you need to try.