What deficiency is this ? P ? K ?

This might be correct, I bought a new all in one and the ratio isn’t too good for flower imo -6-12-6 isn’t the best. But don’t really have the choice atm as all the hydro shops are closed in my area. Your solutions seems logic but idk if making my own mix of npk with startbooster, pboost and kboost will do the trick properly. Seems a bit risky to me 😅 Thanks for your advice, do you have any idea what type of deficiency you see in those pics ?

I've looked and looked but can't find the NPK on any of the myriad of nutes you're giving here... You definitely have a problem and the NPK is where I would start - particularly nitrogen as I believe you've gotten a lockout of some other essential nutrients from too much nitrogen... and here, I would look at the All-In-One ... usually nutes that tell you they give everything the plant needs is a lot of bs ... weed needs a lot of nitrogen in seedling and veg states but then it needs to be knocked back when they go into flower (if not done away with entirely) so a nute that says that sort of thing isn't any nute I would choose to use... you've GOT to be able to adjust the levels of all 3 of the NPK nutes... So, if it IS a nitrogen toxicity, which I suspect, that is locking out the calcium, potassium, phosphorous, throwing a whole bottle of calmag is NOT going to solve your problem - a lockout means that while the nute is there, the plant will simply not be able to get to it ... so you're going to have to do a flush (3x the pot volume of pH'd water through each) - but then you're going to have to figure out how to reduce the nitrogen... What you could try is to cut way back on that All-In-One (like cut it back to 1tsp) and increase the Starbooster and Pbooster .... she's needing a lot more of the bloom nutes at this point... I'd honestly switch the amounts around - give the Starbooster and the Pbooster at the level you're now giving the All-In-One and cut the All-In-One back to the level you're giving those other two... Good luck...