Stacking ?

Once you have a fan moving about over the canopy then your leaf (canopy) temp will always be cooler. Many many places in the US, AUS and I can go on exceed that temp by a lot but air temp doesn't translate into temp canopy unless you got a dead heat in your tent with no ventilation. For true temp you'll need a laser temp reader. Also, I c a bottle over your grow, (co2?) If so with co2 grows you can push the heat (on the canopy/environment) and RH up higher as ppl grow in much hotter humid environments just need good air flow over that canopy. Good luck

29C isn't too hot unless they are showing stress... it's near upper range of what they can tolerate.. and there will be some variance between genetics as to the exact amount any 1 plant can handle. heat can cause "larfier" buds... not necessarily "larfy" buds. It's all relative... super dense genetics won't become larfy trash at 29C vs 25C they'll be some percent more larfy but probably indiscernable to a human eye except in extreme cases, which 29C is not. so, no worries. see if a little adjustment to ventilation can make gas echange a bit more efficient... evaporative coolers suck ass, fyi. open tent during day? depending on current setup, you may be able to drop it 1-2 degrees with something simple like that. run at night and dark during day.... enough overlap with your waking hours to get shit done.

if you are asking are they gonna get heavier, bigger and denser, the answer is yes. if you want to know if all those stems between the nugs are gonna get covered with flowers, the answer is highly unlikely.