Sean Emery, Gavin Heck and Cleris James all went over as Newbridge were forced to work hard at home for their victory over Waunarlwydd for whom Simon Hart crossed twice.
Beddau had a far easier time of it at struggling Fleur De Lys where they ran in six tries, five of which were converted, in their 40-0 rout.
But neither could close the gap on leaders Bonymaen who returned to winning ways to stay four points clear at the top of the table.
Bonymaen slipped to only their third defeat of the campaign last week with a shock reverse at relegation threatened Builth Wells.
But they shook off that disappointment to get back in the driving seat with a commanding 38-17 success against Merthyr. Wing Lyndon Johnson scored two of their five tries while fly-half Gareth Jones added 13 points with the boot.
Assistant coach Ieuan Jones said: "It was important to get back on track after the defeat at Builth. We've still got the other teams breathing down our necks but we have games in hand and we know that our destiny is in our own hands.
"Perhaps a bit of complacency crept in last week but it was a good kick and now if we win our games then we know the title is ours.
"We made hard work of it against Merthyr. After a good start we allowed them to get back into the game but we finished strongly."
At the other end of the table, Ystrad Rhondda looked to be heading to a rare victory when they lead at half-time against Llangennech through tries from Alun Roberts and Richard Wells before the visitors rallied to run out 27-13 winners.
Whitland played the last ten minutes of their clash against Uwic with just 13 men after forwards Ryan Mitchell and Randall Williams were sent to the sin bin but managed to hold on for a 29-17 win.
Gareth Edwards and Justin James scored the crucial tries for Llanharan who edged out Caerphilly 18-7 in a nail-biting encounter at the Dairy Field while Cwmllynfell came from behind to beat Blackwood 20-7 after trailing at half-time.
Wales U20 captain Tom Phillips and performance psychologist Dr Rich Neil explain why spending three days at Monmouth RFC has further strengthened the togetherness of the squad ahead of the #WorldRugbyU20s
Alongside Scarlets flanker James Davies and Cardiff Blues centre Cory Allen, three Wales Sevens core players have made the extended training squad for GB Sevens. Wales Head coach Gareth Williams tells WRU TV's Graeme Gillespie why Luke Treharne, Sam Cross and Luke Morgan earned selection in the initial training squad for Rio.
Wales Sevens head coach Gareth Williams tells WRU TV's Graeme Gillespie he has had to overcome a number of injuries before naming a competitive squad for this weekend's penultimate round of the World Series in Paris.
Merthyr were officially crowned champions of the SSE SWALEC Championship at Dowlais on Saturday where captain Andy Powell paid tribute to his side who have earned promotion to the Principality Premiership
Coleg y Cymoedd's season has had a spectacular ending with victory in two cup finals and a massive victory over one of the best rugby playing schools in the world - Welsh coach Warren Gatland's old alma mater, Hamilton Boys' High School.
WRU chief executive Martyn Phillips hosted the second meeting of the WRU Youth Board last weekend ahead of the Judgement Day IV regional double-header. Tthe board, made up of 15 under-21-year-olds from around Wales, heard presentations from head of participation Ryan Jones, policy and integrity manager Jeremy Rogers and national women's rugby manager Caroline Spanton, with Pro Rugby Wales CEO Mark Davies also on hand to hear the range of views aired.
Wales duo Rhun Williams and Liam Belcher, who makes a welcome return after five months of injury woe, look ahead to next month's World Rugby U20 Championship in Manchester where they will face Ireland, Georgia and New Zealand.