if node spacing is too tight, reduce lighta bit -- because of the rough start, you may need to get light intensity back up to what you had... resulting node spacing on new growth is your guide. it will to a lesser effect space out below, but the new growth will reflect effects of new light intensity better. The tight growth will mostly stay tight, so don't expect too much change there, but will get some breathing room.
The plant is quite overfed, still.. not much you can do about it if it's coming from the soil... stick to good watering habits and it should toughen up once it's larger and can handle the hot soil.
I would not top it at this size (future reference). It wouldn't really do anything functional at this point. Since it is an auto and already less than idea circumstances, i'd hold off on experiementing topping autoflowers until the next grow. But, it is your plant and the difference in yield will probably be only slightly less. It probably won't grow large enough to warrant topping. Autos go into flower about 2 weeks after sprouting.. you get another 4-5 weeks of vege growth beyond that and it stops. I bet you see preflowers by 20-25 days above ground. If not, you know you got more time than i estimated.
best thing to do is keep trying... take note of the power of light you used early on and make sure you adjust that on the next grow.. look at problems, realized the cause is often long before you see it, so adjust your early behaviour and it'll get easier each time. Consider photoperiods. Gives more room for error... you can always vege a bit longer to fix things like this. Autoflowers are not 'faster'. it takes just as long to flower as a photoperiod that was given the same amount of vege time. similar genetic variety on that.. 7-12 weeks is possible... to compare apples to apples the 12/12 switch to flower for photos is equivalent to 7-10 days before you see developed preflowers on an autoflower.
An autoflower is a great plant outdoors offseason. otherwise it just complicates things and weakens the genetics a bit.. ruderalis is a weak plant.