I had a look at your grow journal, congrats on the grow, looking great. I seen the bagseed falling over, it doesnt seem to be harmed at all, In fact I see side branches already starting to form reaching up for the light, your low stress training the fella and you didnt even know lol. Uhm, it doesnt look like stretching is an issue at all, possibly the growing medium you are using not fully supporting the plant. Do you have any fans in your grow room right now. If not I would suggest it, wind is what makes marijuana plants stems nice and thick, make them able to withstand them big buds. hope that helps, happy toking