Hengrove have a four-point lead with two games in hand at the top of the First Division following their narrow victory at bottom side Wellington.
James Dunn's early strike gave the visitors their 1-0 triumph, but team-mate Ricky Charlton and the home side's Andy Butler were sent off six minutes from time.
Hengrove extended their lead at the top after second-placed Chard drew and fourth-placed Shepton Mallet lost, while Calne, in third, did not have a league game.
In-form Cribbs Friends Life drew 1-1 at home to Chard, the hosts' Andy Forward quickly equalising after Sam Clark's 70th-minute penalty opener.
Shepton Mallet went down 4-2 against visiting Bradford, while Corsham moved up to fifth position with a 3-0 home triumph against Keynsham.
Corsham's Liam Brown struck a first-half double, bisected by a Ben Moore goal, while Ross Lye missed a penalty for the hosts after the break.
Portishead took a three-goal lead against Devizes before eventually winning 3-2, Mark Mapstone, Ed Dunn and Nick Steadman on target for the hosts. Robbie Mitchell and Neil Clark replied for the visitors inside the last 15 minutes, but they could not conjure an equaliser.
Almondsbury UWE triumphed 2-1 at Shrewton, Neil Bailey scoring a second-half winner after the hosts' Mitch Wilkinson had cancelled-out Simon McIlroy's opener.
Westbury fought back from two goals down to draw 2-2 at home to Welton, Matt Mead and Phil Hampson rescuing a point after Byron Lismore's double for the visitors.
Oldland came from behind to draw 3-3 at Cheddar, Warminster and Elmore also drew 3-3, while Roman Glass St George were thumped 4-0 at Sherborne. Mark Caines notched a double, while Tony Cunningham and Sam Jarman scored for the home side.
With leaders Brislington not in league action, Cadbury Heath moved to the top of the Premier Division despite being held to a 0-0 draw by visiting Ilfracombe.
Mark Reynolds hit the woodwork for Heath, although Harry James did likewise for the Devonians as neither side was able to break the deadlock.
Bishop Sutton, meanwhile, surged up to fourth place with a crushing 5-0 victory at Bitton, who drop two places to seventh. Pete Shepherd led the way for Sutton with a hat-trick, while Will Hailston and Darren Hawkins also scored for the visitors.
Winterbourne beat Bristol Manor Farm 2-0 with goals in the opening 25 minutes from Aaron Wilson and Sam Vile.
Elsewhere, Street moved up to fifth with a 3-1 home victory over Buckland, Radstock won 2-0 at Barnstaple, Willand triumphed 2-1 at Wells; and Bridport and Melksham drew 1-1.
Larkhall will play Hellenic League side Kidlington in next weekend's FA Vase third round after beating Longwell Green 2-1 in their much-postponed second round replay.
Longwell Green scored through Ben Downes and ought to have added more goals in a dominant performance. before Jamie Lyons and Ben Horan snatched it for the Larks.
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