If it's truly "nutrient burn" @ half strength nutes, then something else is to blame. Not enough drainage in the pot, or not watering thoroughly enough when you feed, I'd say.
Something to keep in mind about overfeeding and lockouts, is it looks virtually the same as deficiency.
What we see as nutrient burn, is deficiency symptoms.
Usually from one of the NPK's like nitrogen locking potassium out for example. Potassium deficiency and nute burn can look quite alike.
My advice is tread carefully now. Be patient.
Assume it is a bit of nute burn, but don't go flushing a whole bunch of water. Just plain water one time to runoff.
Then wait and see if it gets any better or worse. Decide course of action the following watering. (more/less nutrient for example)
Some questions,
what media are you using to grow?
what nutrients are you using?
EC and pH of your feed?
have you been watering thoroughly and to runoff?
If you do have an EC meter, it'd be worth seeing if the runoff water is high, next watering.
It won't be accurate, so don't rely on the numbers, but if it's way high, then it's high.
