Possible soil PH problem?

Hello - I've been reading the forums here for a bit and it's been very helpful, but I've run into something I can't seem to fix. I was fertilizing over-aggressively in the beginning and suffered some nutrient scorch. I flushed plants and have been using just water since (two weeks). I set my water out in buckets and ph tested it - about 6.5ish.

I am also fighting a mite infestation, not sure what variety, but they are persistent little buggers. Bug bombs tonight and then a leaf by leaf wipe down tomorrow. If that doesn't work I guess I'll go get some predatory mites.

But back to the question at hand.



Tip curling under, yellowing on new growth.



Detail of yellowing.



Spotting on leaves of other plant.



More curling on other plant.

I don't think my mites are bad enough to be causing this at this stage, I can turn over four out of five leaves without finding any mites, and the ones I do find are two or three bugs per leaf.

I pulled the plant from the first pic out, flushed it with ten quarts of water (it's a ten quart pot) and took the ph of the wash - 6.0 pretty much dead on.

I'm nutrient-shy from my initial screwup and the symptoms I'm seeing on one plant versus the one right next to it don't seem to point to a specific nutrient deficiency. Are there any other nutrient tests I should be doing on the soil-wash?

Thanks for any advice.
Dix