I would say the trick to using AutoCAD for piping isos is to not draw a 2D iso, but rather a Ortho layout but viewed in a 3D iso view. As an example, in MS, switch to a SW Isometric view, turn Ortho on. Start drawing your iso, when you need to show a radius you just use fillet command, need a valve, insert one and it will look perfect, text is entered the same as always, just like dimensions. No need for iso text styles, iso dim styles; no need for every block to be created in different planes, etc. Wish you had shown that from a SE isometric view, no problem - switch to SE and finish and print.
When you have to show a Z direction then you will need to manipulate the UCS to input text and dims in the right location and plane, so that takes some learning but not much.