ive heard the same thing, so id imagine its ok, just go weak. weak weak. and wait til someone else comments on this, that has done it before lol.
i went and bought a variety of nutrients, made a small batch of each at full strength, and checked the pH. i just alternate nutrients depending pH.
Note: before people flip out, lemme make this clear. i dont grab a bloom bottle during vegetative cuz it ups the pH or vice versa. i have like 5 dif veggie ones, and 3 flowering ones, and 2 of micro nutes. all with a varying degree of pH reaction.