flowering problems

i'm having a problem with my plants in flower. a couple of the leaves have yellowed and fallen off, and the 2nd and 3rd plants'(out of 3 plants) leaves have rust colored spots on some leaves with the edges curled down. they've been getting 2 tsp ej gro/2 tsp ej bloom mixed together per gallon. does it look like a ph problem? i had just recalibrated my ph checker yesterday and it had been .4 high.

grow details:
nirvana bubblelicious
6" pots
hempy buckets, 100% perlite
earth juice nutes
150 watt hps

flush with ph'ed water 3 gal for every 1 of medium. damaged leave will remain damaged yet usefull.

flushing sounds like a good idea. so it looks like a ph issue?

flush with phed water but don't forget that leafs will die off through out the flowering time to