K.I.S.S. Keep it simple, silly. Only spray 1 foliar at a time, because it will help identify any problems that might arise - nute burn, make that solution weaker, toxicity, don't spray with Mg any more, etc etc. It helps prevent a situation where everything goes bits up & you don't know where what went wrong. Also, plain water between feeds. Prevents salt build up, which is nasty.
Yeah the calmag additive is the only salt based nute I'm using at the moment. All other sprays are organic so I haven't seen any salt build up before. With the next run I'l be a bit heavier on the calmag though so will watch out for that. Justin is running LEDs like me and I've been told a few times now that plants under leds like more calmag. I've been giving calmag on almost every feed watering and the plants just seem to suck it all up.