Adam Thurston pushed the visitors up 3-1 in the 53rd minute and although Wee Nix captain Sarpreet Singh gave his youthful side hope with a 61st-minute screamer, Bay United showed character to deny them a leveller.
Having made every playoffs in Angell's four-year stint here, Bay United face the prospect of missing out unless they win a lion's share of games.
It doesn't get any easier as they prepare to face defending champions Team Wellington in another televised clash in Porirua this Sunday after Eastern Suburbs beat the latter 2-1 on Saturday.
"It was great to just get three points, which was probably more important than the performance," said Angell, adding consistency and a dose of luck were vital especially when the opposition strike back and it starts playing on his players' psyche.
"We're going to have to start to change that mindset because it happens and happens quite regularly when we take the lead and start worrying about the opposition rather than strengthening our lead."
He said Nix were a talented group and at times made poor decisions but given time and space were as good as any side.
"Sarpreet hasn't played for them for a while and he showed his qualities with the second goal and also provider of the third."