I find that the faster I'm going, the more stable I am; if I'm moving slowly through choppy water, I often feel tippy.
Obviously practise helps, but I think the thing to keep in mind is to be assertive with the water.
Example: a few years ago we had a downwind race here in Cape Town from Monwabisi Beach to Gordon's Bay. Within ten minutes of the start, the wind swung offshore and increased dramatically. Soon I was in survival mode, heading towards Strand, parallel to wind and waves. I was paddling tentatively and felt very tippy and anxious.
Eventually a wave broke on me and I was in the water. While I was remounting, my paddling buddy came past and that changed my approach completely - if he was still racing, then so was I! And just by being assertive and working with the waves, suddenly the paddle was fun again...
(One of the paddlers came off, couldn't remount and spent 6 hours in the water before finally being rescued by helicopter, but that's another story!)
So yep, practise, confidence, attitude! (Works for me anyway!)
Rob
Currently Epic V10 Elite, Epic V10 Double.
Previously: Swordfish S, Evo II, Carbonology Zest, Fenn Swordfish, Epic V10, Fenn Elite, Red7 Surf70 Pro, Epic V10 Sport, Genius Blu, Kayak Centre Zeplin, Fenn Mako6, Custom Kayaks ICON, Brian's Kayaks Molokai, Brian's Kayaks Wedge and several others...