Skipper Mike Imrie is convinced his Worthing side can challenge for Three South East honours.
The scrum half had a try disallowed as his side knocked Tunbridge Wells off top spot by drawing 8-8 at Roundstone Lane.
Imrie admitted: "I was very proud of the lads and the effort they put in. We could have won, but we were weak in the scrums and failed to build any kind of platform. We need to build on our set pieces."
Wells led through a Kit Claughton penalty and Richard Sharples try but Terry Butler put the hosts right back in it when he rounded off slick move on half-time.
Stuart McLachlan levelled with a 53rd minute penalty and both sides had chances after that.
Charlton Park take over at the top but they trailed 15-0 to Lewes before pinching an 18-15 verdict.
It was another hammerblow for the struggling Sussex side, who were given a great start by a try, conversion and penalty by Martin Lovell.
Scrum half Tim Hemsley then darted over from a quick tap penalty, but Lewes were eventually sunk by two late penalties.
East Grinstead lost 6-5 in a niggly tussle at home to Cranbrook. Ray Hennessy scored a try and Ricky Lake was inches from winning it with a late penalty.
Brighton host Worthing next Saturday looking to bounce back from a 19-11 reverse at Sidcup.
Geraint Jones' try gave Brighton a slender first half lead. Paul Charlton kicked two penalties and skipper Gary Henderson said: "The forwards did particularly well."
Eastbourne turned on the second half power to stay top of London Four South East. They ran in six tries to make it four wins out of four and keep their noses ahead of Dartfordians on points difference.
The pack did their bit with powerful scrummaging while the backs monopolised the scoring.
Paul Newell, Matt Allchorn, Andy Moore, Matt Bremmer, Paul McKay and Danny Craven went over with Moore adding four conversions and a penalty.
Heathfield should have led hosts Chichester by more than 11-3 but ended up hanging on for a draw.
Lewis Beale cleverly worked space for a Will Drinkwater try and also landed two penalties.
But Chi skipper Declan Hutchings rewarded an improved second half effort by his side with a try, to which Andy Johnson added his second penalty. Heath No. 8 Ian Jenkins was sent-off after a scuffle bit the visitors withstood heavy late pressure to earn an 11-11 draw.
Hove's game with Bognor was called off because of the midweek rain.
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