Hey BD,
Not sure how you will go at Lembongan in August with swell direction etc but there are some beauty waves there...
I've been over a few times and haven't supped everywhere on the island but have had a ton of fun in the Playgrounds area. In the photos, the 'X' is where the boats will drop you off... from there:
1. - Playgrounds, crackin little peak with a left and right. Great fun and easy to get to. Can get crowded
2. - Not sure this areahas a name but across the channel there are small peaks to be had. I would predict in a bigger swell this would become a significant R brake along the channel
3. Lacerations, medium to fast reef break holds a large swell, would imagine it lives up to its name if you mess it up
4. Shipwrecks, long paddle out and again, seems to be a pretty intense wave
In the other photo, the area off the bottom of Ceningan island is Secret point. I haven't supped it but have drooled significantly over the left hander that wraps across there. A mate surfs it a lot and loves it. Heavy, Fast but totally rippable. Its worth hiring a bike and taking a cruise over there just for a look anyway. Used to be seaweed farms on the reef in front but I think they may have been removed.
Big Hugg has given you the good oil on the Sanur Breaks.... if you an jump on a boat to Serangan Island you wont be disappointed. Talk to the Rip Curl Crew. The 9ftr will be a good choice....