PH and soil test ..
1. get plain water check the ph of that,
2. Pour ph tested water threw the container and CATCH THE FIRST PART OF RUN OFF!!! make sure u collect the first of the run off ,, very important here .
3. test the run off again with PH meter and report these 2 numbers .
were looking for a difference between the 2 numbers . and if there is a difference.
just a slight difference between the 2 numbers could mean big numbers between.
i think u got a ph problem ,, u look to have 2 or 3 problems ,, not just leaf curl.
and the 3 problems are looking like the sea saw effect ,, were one element went bad on one side of the sea saw , and the balance got the other side of the sea saw off!
thats why i call it the sea saw effect lol.
ADDED TO: Do you have a ppm ,, ec. meter to check the ppm of the run off .. and also check the ppm of the water your using also , do it same way your doing ph test !