Tries by Mark Thorley and Richard Powell – who also kicked eight points – helped the visitors to a fine 21-6 victory, which also saw them leapfrog Beddau in the table.
Their failure to seal a bonus point, however, means Blackwood are the new leaders after they hammered strugglers Bedlinog.
Their entire back row – David Forde (2), David Brake and Gareth Rusby-Davies – scored tries, as did full-back Krystan Perry, in a 37-10 triumph.
Gilfach Goch produced a stunning last 10 minutes to edge a thriller at Merthyr.
Tries by James Howe, Matthew Rees and Adam Williams had given the hosts a 28-20 lead heading into the game’s final stages.
But late tries by Gareth Walters, who had also crossed earlier, and Adrian Williams turned the game on its head as Gilfach stormed to a 34-28 win.
Ebbw Vale stay fourth after tries by Lee Meredith, Gary Watts and in-form Wes Cunliffe helped them to a 25-8 win at Rumney.
Llanharan are finally off the mark after beating Treorchy 23-19 but there was no such luck for basement side Ystrad Rhondda, who lost yet again, this time 24-8 at Bargoed.
Bridgend’s superb start to the One West season continued as they beat their cross-town rivals Bridgend Athletic at the Brewery Field.
Kyle Barnett scored the victors’ only try, but it was Dan Griffiths, with six successful kicks, who guided Bridgend to their 22-13 victory.
Runaway leaders Narberth show no signs of letting up as they smashed bottom side Maesteg 44-16.
Wing Roger Davies ran-in a brace, while Steve Martin and Adrian Killa also scored, as Narberth opened up a two-point lead at the top.
Whitland recorded a first win of the season as full-back Jonny Morgan inspired them to a 30-26 victory at Waunarlydd with a brace of tries.
UWIC bounced back from last week’s defeat to win 26-16 at Carmarthen Athletic, Corus beat Felinfoel 33-19 and Bonymaen recorded a fine 29-6 victory at Llangennech.
