wtf...nute burns or deficiencies ?

I'm stumped guys, here's the story:

One month old+, grew in a small pot, transplanted a week ago (untill then no problems apart from a little yellowing on the lowest leaf). So far I had been watering it with a 1/4tsp per gall of Dynagro Foliage pro. After transplanting it started to show signs of nitrogen and magnesium (?) deficiency or so I thought. I gave it some CalMag. Things got alot worse (see lower leaves) after a spinosad treatment (I had thrips), the tips burned and curled like a nuteburn.
I also think a problem might have occured when I watered it after transplanting but not enough. When I did water enough to get some drainage water for a pH test I noticed the soil caving in alot and making holes around the smaller pot area. The pH test was normal by the way, around 6 - 6.5.

So what do you reckon ?

Hey how are you today? What is the NPK you are running with? and what soil medium?
MD

To me it looks like burn and deficiency's, First it burned then locked out and now deficient. If it were me I would repot in new medium, wait one week, feed with Kelp Juice wait 2 weeks and feed normally, it would have new growth and be happy. Have a good one!
MD

hey moondance, sorry I forgot to mention: The soil is biobizz lightmix and the NPK of Dynagro is 9-3-6.
I was feeding it with half the strength of the "maintenance" schedule (1/4tsp per gall) which is 1/8tsp per gallon...its very diluted. The "production" schedule for weekly application is 1tsp per gall.

my thoery was that it was a little deficient and the bad transplanting stressed it (the air pockets in the soil). Then it got stressed and burned from the spinosad treatment (all that tip burning and leaf curling happened after the spinosad treatment). The soil pH is good though so I don't think its locked... but i dont know what to do.... I just repotted it a few days ago.