Bali mola mola - best timing

[bubblevision]

Planning to go to Bali later in the year and want to time the trip to have a good chance of videoing mola molas.

http://www.balisunfish.com/best_season.balisunfish has the optimum times as follows:

August 9th - August 17th
August 24th - September 1st
September 7th - September 15th
September 23rd - October 1st
October 7th - October 15th
October 22nd - October 30th

I can only stay for one of those periods so which of these is likely to give the very best chance? I'm thinking September, but which of those two slots in September?

Thanks!