Ynysybwl suffered their first defeat of the season in Division Two following their heart-breaking 22-20 loss at Newport Saracens.
Simon Skinner's late penalty ended Bwl's three-match winning run and put them into third place in the table.
David Davies had already grabbed a brace of tries for the home side to add to Mark Bale's strike.
Instead, Llantwit Fardre hit the summit with a gutsy 27-26 victory over Rhydyfelin while Treorchy also leap above Ynysybwl into second spot with a six-try romp over Garndiffaith.
Abergavenny top Division Three after grabbing a five-point victory in their 31-3 home win against Croesyceiliog but Rhymney are hot on their heels following a comprehensive 34-3 bonus-point win over Blaina.
Greg Plant, Matthew Chard, Ioan Lane and Liam Buckley scored the tries to gain maximum points for the home side.
Fly-half Steve Lang grabbed 14 points in an impressive display which included three penalties, a drop goal and conversion.
New Tredegar scored six of the best in Division Four on their way to a comfortable 37-7 win at home to St Josephs.
But home dominance did not sweep the division as Old Illtydians, Risca and Talywain all recorded away wins at Machen, Abertillerty BG and Monmouth.
As the countdown continues for RWC2015, Tournament Chief Executive Debbie Jevans visited the Millennium Stadium to discuss preparations for the eight matches and reveal the positive news that 100,000 tickets for games at the home of Welsh rugby have sold in the last seven days.
Jason Harries is targeting a first win on the World Series circuit this season with Wales. The series returns to action this weekend in Dubai where Harries is part of a team hoping to build from its efforts in round one in October.
Wales skipper Jevon Groves says his side have addressed a few points from Gold Coast and aim to 'hit the ground running' in the next two rounds of the World Series, kicking off with this weekend in Dubai before heading off to South Africa next week.
Wales Sevens manager Steff Thomas is hopeful his side can build from a quarter-final spot in the opening round of the World Series in Australia when his side take part in the forthcoming double header in Dubai and South Africa.