You're correct in thinking the NE predictions are "low-ball". It's nearly always windier, sometimes a lot windier.
Currumbin is, I think, usually best around 12, on a high tide.
It is high tide at around 12 tomorrow (Friday). See you there.
It will be the last day of my rather extended holidays, so hopefully a cracker. I'll be the one on probably purple&orange NP sail, the one fluffing every gybe/wallowing in the impact zone/being overtaken/having a great time.