Purple Mixture.

Keep it with the veg nutrients during the 1st week of stretch , then during the second of stretch you can do half grow half flo and after you can go with full flowering strenght. But it seems that ruderalis needs more N during the flo than classic strains so you can add a little extra N everythime you think it is necessary but not too much to avoid any excess

Your topping is pretty clean even if like you said your plant was looking like a lil tree before that : it's now looking like a lil bush which is not that bad. Fortunatly you did your Xtrem topping on a photoperiodic plant so she'll recover soon enough. I hope that you have kept the apex to try to clone it ! You can put something to treat the wond but if you don't then the part you'v cut will dry just before the node and naturally "heal" , I know that there is a red kind of "glue" that peoples are putting on the plants scares or that they are using to make grafting : sorry I don't know the word in english to tell what it is.