Yeah it looks like a very light burn of some kind (most likely nitrogen) but if it isnt getting any worse I'd keep the feeds right where they are at, if it gets worse you may need to back off the feeding a bit.
If you start seeing "the claw" you know you have major nitrogen toxicity. In major nitrogen toxicity, what happens is the leaves turn super dark green, almost like dark lush camo green and they do almost a 90 degree angle downward on all of the tips of the leaves back a few mm to a cm and it looks like a garden rake. On some of my grows I've had the classic so I can provide pics of first hand nitrogen toxicity if you want to see it happening... but its buried so itll take me time to go back through the last 5 years of grow pics.
During your transition period, and then onward when you get in to bloom you're going to need to cut back on the nitrogen (n in n-p-k) and up the phosphorus (p) and potassium (k) and some micro nutrients might need to be supplemented if not in the nutrient regimen.
