I spent a year backpacking around Africa about 15 years ago, and the music of Anglophone west Africa - Ghana and Sierra Leone in particular - was the best music of the trip, just a huge amount of fun. I'm
really surprised that there hasn't been a breakout act into Europe from there (unless I've missed it) like the Malian desert blues of tinariwen and songhoy
Blues (a sound which does nothing for me) or central Africa like staff benda bilili or mbingwana star (which is fantastic).
I've a load of cassettes in my loft from the travels but most of the ones from that region are just unmarked tapes or local dialect stuff so unfortunately I've nothing to particularly recommend, and like you I do keep trying to find it, so keen to hear if anyone has.
It's definitely a guitar sound I wish David tattersall would go back to, the wave pictures have moved a long way from this sound in their last few albums.