Burn or calmag deficites?

Looks to me like one of two things. The first is not too serious, water spillage when feeding can cling to the leaves and "burn". The second, its possible pest issues check the underside of the leaf to see for any bugs! 🌱👍

if your nutes specifically say "use at X pH" then stay there, otherwise i'd suggest raising it to 6.0-6.5 range in a soilless setup. how are your watering habits? religiously getting 10% runoff from each? Ensures entirety of substrate is saturated, coutneracts evaporation, and wet-dry cycle helps prevent pests. (allow top layer to dry - less than you would for soil, because it holds less water per volume) if anything above is off, try those things before drastically shifting nutrient formula. pH alone can cause every single problem even while also providing a perfect amount of nutrients for the plant. if you can calculate the ppm of NPK et all, then you can make an informed decision about any adjustment needed. e.g. if around 100ppm Ca, you likely don't need to add anymore. that's a ballpark figure that depends on your tap water a bit too. Some plants may be more robust than others. I've had weird issues lately with my tap pH changing and trying a new substrate that ended up very acidic. Some stuff handled it, but most were very unhappy or died, lol. shit happens... easier to say now than a week or two ago.