@TwistedSista, Hey, I do feed with every water(may miss 2-3 the whole grow). have seen a build up of salt once or twice. Was easy to correct with one missed feed.
I use this as a guide and just use the lower figures (the amounts are for 10L btw)
https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fi0.wp.com%2Fwww.hydrostork.com%2Fwp-content%2Fuploads%2F2019%2F10%2Fcanna-coco-feed-chart.png%3Fresize%3D1020%252C554%26ssl%3D1&f=1&nofb=1
Never had any major issues with the COCO A+B, I do add extra CalMag and that corrects any small issues.
like