This was 4yrs ago,,, there was a top local bloke, with a shop on the water front as you head down towards the river mouth, who was hiring ok gear out.... Watch out for the cobra snakes!!! One was hiding under a board!!! Which was promptly executed and buried in the beach.....
The winds were quite light the time of yr we were there June.,About 15 to 18 knts was as good as it gets.... the waves were Very impressive though, especially the reef in front of the break water.
You can't sail at low tide.
Also try jankie, hes a sup /kite surfer based in sanur, may be able to help out, search these forums for user name ....kite surf Bali....another top bloke, he is very helpful