As long as it is properly washed and buffered, it shouldn't impact pH ... If not buffered properly, you'd probably also have a bunch of leaf symptoms coinciding, so if the plants are healthy, that would help feel better about the buffering of the coco. If it is a buffering problem and it doesn't kill the plants with sodium sickness, then it will fix itself over time. It'll slowly come into equilibrium with whatever you are providing and stop leaching off nutrients from that point on.
it could be as much about your fertilizer as anything else. with coco, you should be using products for a hydro or soilless context as coco provides no nutrients on its own -- or should not impact fertilizer formula, if properly buffered.
A good soilless/hydro fertilizer should be pH balanced and buffered to avoid drift.
A good soilless/hydro fertilizer should provide all of what is needed at a proper balance. It should be 100% soluble and 100% plant-ready when dissolved into solution.
If you want something that translates between brands i have a ppm breakdown in the germination week of my 3 most recent diaries (calculated from gauranteed analysis labels not some shoddy EC conversion to ppm). I'd suggest something that has a similar ratio of nutrients when mixed together. There are apps and websites that can do this math for you.
lots of similar brands do similar things - jack's 5-12-26, megacrop, cropsalt, kosher something, masteblend, southern ag, et al... There's a reason you find a similar setup with similar dosages across numerous brands... all based on the existing knowledge.
All fertilizer requires some adjustments for your local variables, but it should never be drastic or extreme.. that's just a sign of an esoteric formula that won't work well for many plants.