They comfortably saw off play-off chasing Corinthian-Casuals 4-0 at the Fullicks Stadium on Saturday and are sixteen points clear at the top with only seven games remaining.
In front of a crowd of 405, a goal in each half from leading scorer Ian Draycott and second half efforts from Ronnie Dolan and Frankie Chappell sealed Invicta`s win against an in-form Casuals outfit.
Dorking Wanderers, Worthing, Herne Bay and Hythe Town currently occupy the play-off places and all-bar Bay won on Saturday.
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They lost 4-2 at Dorking, whose Tom Tolfrey bagged a brace in the ninth minute from the spot and on 49 minutes.
James Turner had pulled Bay level right on the stroke of half-time but by the time Danny Walder scored their second from the spot in stoppage time, Wanderers were already 4-1 up after goals from Dean Gunner on 65 minutes and Jake Beecroft on 87.
Third-placed Worthing were made to work hard for their 1-0 win at The Belmont against bottom-markers Whitstable Town, Lloyd Dawes` penalty two minutes into the second period proving decisive in the end.
Hythe were 2-1 winners at mid-table Whyteleafe, who led through Sam Clayton`s 19th minute effort right until 17 minutes from the end when Vernon Francis put through his own goal. Ben Wilson then won it for Hythe in injury-time.
Faversham Town, Hastings United, Ramsgate and Molesey all have chances to mount a top five challenge, and all-bar Hastings achieved victories on Saturday.
The Sussex outfit lost 3-1 at Colston Avenue against Carshalton Athletic, whose Jordan Higgs bagged a brace in the 72nd and 90th minutes after Tommy Bradford had given the Robins a 17th minute lead that Billy Medlock cancelled out in the 66th minute.
Faversham beat relegation-threatened Chipstead 2-1 at the Shepherd Neame Stadium, coming back from being a 72nd minute Derek Tieku goal down to win, thanks to Charley Robertson two minutes later and then, bizarrely, in stoppage time when Town keeper Will Godman`s long free-kick somehow found its way into the back of the net.
Ramsgate comfortably saw off fourth-bottom East Grinstead Town 4-0 at Southwood, thanks to a Kane Rowland hat-trick in the ninth, 19th and 55th minutes – Nick Treadwell adding the other in the 15th minute.
And Molesey saw off Chatham Town 2-1 at home, thanks to Rob Sheridan after eight minutes and Stafforde Palmer two minutes after the break, with Khari Oriogun replying on the hour-mark for the Chats.
Second-bottom Peacehaven & Telscombe picked up a point from their home game against Tooting & Mitcham United, but are still five points behind third-bottom Walton & Hersham, who lost at mid-table Three Bridges.
Antonio Simeane gave the Terrors a 55th minute lead but Haven rescued a point through Derek Ubah 11 minutes from the end while Hakeem Adelakun`s 21st minute effort proved enough for Bridges against the Swans.
Elsewhere on Saturday a crowd of 804 saw Guernsey maintain their good home form with a 3-0 success against Sittingbourne, courtesy of another brace from Ross Allen to take his tally to 27 to date, and one from veteran Ryan Zico-Black, while Kofi Quartey`s ninth minute goal proved enough for South Park to win at Walton Casuals.
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