When using 1- and 2-part MegaCrop, I never tested or adjusted pH, using mid-Atlantic East coast river derived water in range of 225-240 ppm, pH about 7.2-7.4 in coco/perlite (but I am a poor role model for this).
MegaCrop is very tolerant of starting water pH, can deal with a fair amount of variation from optimal. But even if highly buffered, it wouldn't be AN-type "pH Perfect" which primarily involves better chelated nutes inherently working/being taken up by the plant over a much wider range of pH, not buffering. [The high quality amino acid chelated nutes in MC may actually do this more than most other nutes, so in that respect MC is essentially more "pH Perfect-like" than most nutes]. The AN "pH Perfect" nutes have some buffers, but these are not the primary mechanism allowing largely ignoring source water pH.