3rd plant not flowering week 4-5

Is this your Gorilla Glue? I wouldn't worry about it as I'm sure she'll catch up. Every plant is slightly different from another, especially with autos - I had a grow where one plant gave me lots of flowers but not one single trichome while the other plants were dripping with them... same strain, same seed bank, same breeder, planted at the same time! I ended up pitching it because trichomes are the goal... One thing I would be concerned about is that topping is not ordinarily done on autos... they have their own pre-programmed plan of what to do when and how to do it... honestly, the most radical thing I do with my autos (and they are all I grow) is some LST and a bit of defoliation if the plant is too bushy... but you've done it and you can't take it back... Give her some time and I'm sure she'll come around. One other thing sticks out for me in your diary that worries me a bit as well... I'm not familiar with your nutes but it seems you're giving them a lot of grow nutes (am I wrong here?)... grow nutes have a lot of nitrogen in them which flowering plants do not like, do not need. I would start cutting back on them and boosting your flower nutes or you might find yourself needing to do a flush down the line to correct nitrogen toxicity - and that's a bloody pain. Good luck with your grow, be patient and enjoy the journey... you're doing fabulously and you will be well rewarded!