Looking for valve train noise help!

If everything keeps checking out fine with lash and adjustments, you may want to consider the oil.
If an oil is a little light it will cause this same issue (what sounds like noisy lifters) but have good oil flow.
Just like if the oil were to heavy you would have poor oil flow and noise.

That's just my thought, only because I have to run 2 different oils here for cold and warm months.

Good luck