help with cotton candy

[buckeyetrouter]

been playing with getting that cotton candy effect on the water and still struggling a bit....any suggestions / tips would help.....

currently using Nikon D50 digital SLR, can go as low as 200 ISO and make most adjustments that a film SLR can do....using a tripod and the timer so I don't jiggle the camera.....

below are a few experiments

thanks in advance
buckeyetrouter