DWC Yellow leaf tips (leaves in bud sites) day 12 flower - healthy plant fast stretch

@Fusion It's at the top of nearly every main branch, also on the main branches that are less far away from the light. Ill try lower ph and give less nutes thanks 👍

More info: All pictures are from today apart from the last pic is from yesterday (you can see the leaves are lighter in color). She has been taking water with an EC of 1.7+ for 10 days now, with the water PH and EC staying pretty stable, I change water res every 7-10 days, and top up when needed (this one needs a top-up because she drinks quite a bit of water). The lower leaves are all nice and healthy, I can't see any signs of nitrogen toxicity (no curled down leaf tips). The lights are on full power and I hang them at 35cm from the top of the canopy (and adjust the height every day) - the closest its been is 33cm. The yellow tips are also present on bud sites a bit less close to the light. If I don't figure out what to do I will first lower the nutrient dosage and wait a day or two to see how she reacts. FYI ph is 5.8-6.5, most of the time around 6.0-6.3 but I try adjust the minimum possible to let it swing a bit (and the PH stays pretty stable which usually means she is drinking the nutrients/water in the proportions present in the reservoir). Any input is much appreciated! Basically I'm hesitating between over fertilization and lack of nutrients!