Enough to get some runoff not in a flushing manner. Just to do its job.
3.0 ec runoff. Ec121 I think is their name, they really helped a lot talking about check runoff ec, its solved the issue half the time. I know what that means lol shes cookin in salts!
Feed more often if not work get a bucket feed them seperate lower ec.
Your EC is a full point above inflow.
Typically the steps to lower runoff EC in high-frequency coco fertigation is like this:
1 - increase the number of fertigation events
2 - keep fertigation events the same but increase the amount of runoff at each event
3 - lower inflow EC
If number 1 doesn't lower the EC (or it isn't practical to increase the number of fertigation events), then number 2 should be applied. If number 2 doesn't lower EC, then number 3 should be applied.
In your case, though, you're a full point above inflow. While a flushing agent will flush out the salts quickly with less work, generally it's best to just flush with your normal feed until the runoff reads the same as the inflow number and then resume your normal fertigating using #2 to keep the issue corrected.
If that is going to take too much feed (usually 3-5x the volume of the pot), then you can do it with half the EC of your normal feed and that will bring it down with far less volume.
Being that your plants don't look terrible, then you can just increase the runoff substantially and it should lower down in a few days. Just be prepared to do a feed flush if it gets worse instead.