Tips burning & still at very low Nutes?

Some plants can take lots of nutes others can't.


I always recommend starting 1/4 strength wait a week and see how they do then 1/2 strength the next week and keep increasing 1/4 each week until you start seeing tips burn

 

Looks about half way through flowering, and looking very good. The burning seems to be very minor albeit widespread. A sudden change or spike in pH, a miscalculation when you mixed your nutes one time, there's various ways it could easily happen. If you've recently increased the strength it could be a one-time shock. It could even just be a quirk of the plant that it doesn't tolerate high levels of nutes.

If you have increased the nutes, it's a sign you should dial it back a little, but otherwise they look great. Good colour to the leaves, buds developing well, despite the apparent low ppm. Keep doing what you're doing.

 

I'd be looking at my temps and Humidity levels

here you maybe in for a surprise,

keep a small fan active and RH of about 65% is ideal

good luck