Naim and Harbeth speakers?

I recently upgraded my 5i V2 integrated to a Supernait 2. I am considering eventually upgrading my Sonus Faber Venere 2 stand mount speakers. There is nothing wrong with the SF Venere's. I like them very much. But, I know I can do better and my budget allows it. My source is an ND5 XS streamer.

I am primarily looking at stand mounters. I have often heard that Naim amps match very well with Harbeth speakers. The Harbeth model I am looking at to match with my SN 2, is the Monitor 30.1.

I have three elements that are very important for me in a speaker:

-1. I do not need earth shattering deep bass to be happy, but I want tight, fast and articulate bass. I don't want bloated, slow or loose bass;

-2. I like a detailed, but smooth tweeter (no brightness or metallic sound);

-3. I like FAST speakers. I need speakers that are fast, rhythmic and have PRaT. I love the Naim sound for its speed and rhythm. So, I want a speaker that can keep up with the SN 2's pace.

If anyone of these three criteria are not met by a speaker, it is a "deal breaker" for me. I am reasonably confident the Harbeth M 30.1 can fulfill 1 and 2 (can they?). But, I have heard on a few occasions that the Harbeth's tend to be slow and lack speed (see John Darko's review of the P3esr as an example). 

I can audition the Harbeths, and will if it is worth it. But, I would greatly appreciate any opinions.