Yes -- if I may state the obvious -- you have made a quantum leap from your 2019 grow. The question is why the plants were so much smaller last year, but you figured that out: soil pH and nutrients are what you've changed, and you can see the results already.
My guess is the WW/G high would probably have more body than G, and also more of a head high than the WW. Best of both worlds...
Nah, these weeds are tough. Supercropping isn't "stress" like heat stress or stress from over- or underwatering. My experience is the plants will heal in a matter of hours.
Going forward (thinking again about heavy buds at harvest time), you might consider spreading out a nylon bird netting over the tops of your plants to hold up the heavy buds and at the same time give you something to tie the colas down to, to keep your stealth cover. You could stretch the netting across the top of both plants at the level of the balcony railing and below the "snoopy neighbor line of sight".
26 C is wonderful cannabis weather, doesn't get much better. If you are concerned about the hot tiles, why not cover the tiles with something that keeps the tiles around and under your containers in the shade? Other pots, wood, boxes of some kind, even a chair or table, to keep the sun off the tiles and reflect the heat away.
Gorilla Glue Auto (who is the breeder of this seed? there are several versions of this) has ruderalis, indica and sativa genetics as far I can tell from seedfinder.eu. I guess there could also be phenotypes. Maybe your particular plant is more indica- or ruderalis-leaning than your friend's.
Or -- lol -- maybe the seller got the seeds mixed up AGAIN!
Why the late watering? Did they suffer from the heat again today, too dry?