If... as you said... you listen primarily to acoustic music - you will have a very difficult time to find anything that matches the Harbeth’s rich, warm, life-like sound and imaging - except for the ESL 57’s and maybe the Maggie LRS+, which I also have, and like as well as the Harbeths.
Especially with strings, horns and all things acoustic!
Though, if you want a bit more of a "bite" in the instruments - the SHL5 XD will provide that, as well as the 30.2 XD - perhaps at the expense of a bit of some of the smoothness.