I just returned from a July 21-31 cruise on the S/Y P Siren (which is what they're calling the boat until they relocate to the Philippines later this year). Spectacular trip on a gorgeous new boat, with an unbelievable mix of macro (critters galore), superhealthy reefs, and big stuff (mantas, sharks, giant trevallies, Napoleon wrasses, turtles). Throw in Komodo dragons fighting and mating on the beach during one of our surface intervals, plus a park visit, and it just doesn't get any better.
The crew is superb and you will love them and the boat. Frank, the owner and MC, is a classic.
Most of the dive sites are warm (around 29C / 84F) and I regretted bringing only a 5mm. A 3mm would have been fine and some people were in shorties. For the dives in the southern areas, which get colder currents from the Indian Ocean, the 5mm with a 3mm hooded vest underneath was nice as the temperatures were as low as 23C / 73F.
At check-in in Denpasar (Bali) for the Merpati flight to Bima, they said I was 3kg over the 20kg limit, but when I said it was dive gear they just smiled and said no problem. Same thing on the return hop.
HTH and let me know if you have other questions.