They lost ground on the leaders but Paul Dunne and Michael Hoey are still in with a chance heading into the weekend in the Alfred Dunhill Championship at Leopard Creek.
Joint leader with Charl Schwartzel overnight following his 66 on Thursday, Dunne followed up with a one over 73 and slipped to tied 19th on five under par.
He's only six shots behind South Africa's Brandon Stone, who added a 66 to his first round 67 to lead by one on 11 under par from Schwartzel (68) and England's Chris Hanson (65).
And Hoey is only a shot further back in her 25th as he bids to win back his card.
Darren Clarke (78 76) and Jack Hume (73 81) missed the one under par cut comfortably.