East Grinstead have finished in the London Three South East relegation zone but they went out with a 7-3 win at Lewes.
The result cost Lewes a chance of leapfrogging old rivals Brighton and finishing third.
Neil Rumble put them ahead with a penalty but Guy Cooke scored Gs' winning try.
Kevin Martin added the conversion and his side withstood a lot of pressure in the final ten minutes.
Eastbourne led 12-5 in the second half at Gravesend but eventually lost 19-12.
Spencer Pullinger scored in his final game for the team and Danny Craven added a sharply taken effort from a tap penalty with Adrian Norwood converting.
Brighton went down 25-20 at Tonbridge Juddian though outgoing skipper Mark Jenkins felt they should have won.
Jenkins, playing his first game since early January, said: "We were better than them. We gave away a silly try in the second half but we fought back really well."
Mark Gibb, Vic Jones and Andy Pinnock scored tries.
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