Please remember that the "original ask" on this thread as not just about the two step sub genres that keep coming up, but "smooth, laidback and funky sound I'm looking for"
I don't think it's just about BPM's, it's about "Scenes". The scenes as far as I know (but I am old and can just about manage 2 steps) are the Two Step (morphed from the jazz funk) "scene" that appeared in the late 70's and early 80's (In the UK and particularly in the Midlands, Birmingham, Manchester and Nottingham to name a few, but Colin Curtis would fill you in more and he's even older than me!!!) The London "Scene" in the mid 80's +, that has been often referred to on this thread and the "Steppers Scene" in the USA. There of course is the Two Step "Scene" on the "Northern Soul Scene", which consists of 60's to present day tunes of a slower beat