Gday Hoppy, Ill also be there in August. Im 83 kg also and have been a few times b4. Ill be taking my 6'3 and also a 6'7 semi gun. Should do the job no worries. Just remember what ever you decide on your only allowed to take in 3 boards at a time.
As for waves head out Bingin way , Ulu's , Kuta reef! Or get over to Nusa Lombongan. Its well worth the trip at this time of year.

All the best mate.