Hi Guys,
I used to live in Malawi as I was born out there, and fished a number of these dams for bass - see below a good brace. most of these dams are in the Chyolo area, on the tea estates - but as highlighted in the first post, I do believe most are private waters. If you sniff around ad perhaps enquire at the Angling Club in Limbe/Blantyre you may get some leads from a few local expats.
Whether these dams are being hit by locals/workers now I could not say, but it is also a distinct possibility, seeing how other waters - Zomba (Chagwa dam/Mulunguzi stream) for example, have deteriorated over the years.
Tight Lines, RF.