I’m another new beekeeper in Sunny Queensland with a flow hive and had most of my hive hanging off the front and below the hive on one of those first 40+C days. I had read about letting the bees do the air conditioning themselves and closing off the bottom board which is sound advice from some very experienced beekeepers - but wanting to experience things for myself, I actually took the corflute board out on the next 35+C days and haven’t had anywhere near the amount of beading as I experienced with the corflute board in (top slot).
On those days of mid to low 30s, I leave the corflute board on the second slot to allow some air flow in to the hive and plan to put it back in the top slot when the days cool off.
My observations were that I think the bees temperament improved when they weren’t so heat stressed and the negative was that removing the corflute board let the wonderful smell of the hive out and was more of an attractant to SHB. To offset the SHB increase I have introduced an Apithor trap which seems to be doing a great job at controlling the ones I can’t get to.
Seems to be more than one opinion for everything you do in beekeeping