Ah great appreciate your thoughts mate, yeah that may be it that I'm overstretching it. Yeah I've always had the tip only just off centre (only slightly to the right of the centre, maybe towards 2:30ish?), at a slight angle, and creates a great whirlpool. After stretching I don't move the tip but just it become submerged. Has worked great but am trying to experiment with other techniques. I keep finding that if I try having the steam tip closer to the edge of the jug, that it spins the milk around fast, but it doesn't really get the whirlpool effect going and doesn't submerge and incorporate the milk into the centre (doesn't fold it under). I'll keep experimenting with angles maybe.. Cheers 🙂