I still get this problem in my grows, some of the time and its not as simply as feed nutes or not.
nute burns means high ec in the roots, so you could give the plants loads of bloom nutes and lock out grow (n) nutes, so you flushing the root zone, and give the plant more bloom and the problems get worse
I use biobizz grow and bloom, so I would try 10ml grow and 30ml bloom in 15ltrs of water and have check the ec,ph can't remember what it was, but I think my tap waters, ec is about 0.6 and adding the grow and bloom takes it up to about 1.3 and keeping this under 1.6 is good in soil imo
and my ph is about 6.6, so this is a good mix for me in flower and I still check the ph/ec level from time to time
you what the ec to stay as low as you can, but give the plants what they need at the same time, no point giving the plants more nutes than they need, it will build salt up in the soil and damage the root zone.
give the plant some grow and bloom nutes but a light feed and see how they go
good luck