i like mooloolaba myself also. long way to drive these days so i don't go visit to often.
sweet spot. i usually head out at the rotary park at the end of Parkyn Parade. Mooloolaba usually gets beter wind then golden beach in a NE'r. it's alsp a great beach to do the walk of shame at. lots of talent in that area.

the gear you're looking at bringing will be good for the majority of time and especially when the NorEasters are blowing. but for the SE winds it will be a little big from time to time.
also you'll need a smaller sail like a 4.2m for when the wind is over 25 knots. qustion will be how good will the SouEast winds be this coming season? the previous season was fantastic with 20-30 knots at least 3 times a week for 2 months. some days hitting 40. That was very unusual though.
Maybe bring along a really small wave fin to help settle the board down in the stronger winds. I reckon the best quiver for you're weight in qld at that time of year would be
4.2,5.0,5.7 plus a 90 litre board and a 70 litre board (for the strong winds). that would have you on the water at least 4-5 times a week. you are lucky being a lightweight! the rest of us go slalom sailing.