I love and agree with Ezzjaybruh ... (although I DO love autoflowers most definitely!) - but you're growing what you're growing and you can't change either the seeds or the seedbank right now (LOL!) - and you're using the nutes you're using and to change them up now would be disaster... so let's deal with what IS...
What IS, is the fact you're 2.5 weeks away from harvest and you've seen another grower using the combo you're proposing and you've seen it was successful - so MY question is "why do you hesitate?" Go for it... you are NOT going to kill your plant, you ARE going to get a harvest - just do it and see if you can tell it's made any difference! For me to know if something has made a difference, I would have to do a side-by-side grow, one without and one with ... so I'm not sure you'll be able to tell if the combo does great things - but it certainly can't hurt at this point... Go for it!
Good luck!