Hey man. Yeah high ppm can come from soil. As nutes last much longer in soil you could be reading EC from salt build up. If you gradually feed her with water and try not over feed on nutes. A simple 1l mix with all your nutes split up over 2 feeds with water every 2 days then 500ml nute solution 500ml of water. She's big enough where she should be able to drink it. ID say build up the nutes slowly if you were coming of a bad tox or something but if anything she'll want an extra kick. As for the PPM don't worry about that too much as I said flush run-offs from soil can be very deceiving. If you stick to what she's on and give regular feeds every 2-3 days. You can over water your plants not only by too much liquid but too often can lead to lots of probs too. She looks very healthy and N-P-K looks solid as it is. Very healthy no signs of overwatering, try cut out the flushes though, you want your plant to take all the goodness and she'll be able once you supplement her feeds with reg water feeds in between. Your PPM is solid too. As you go on you might even wanna push her up to 1400 or beyond depending how big she gets. Good luck pal.