Plants of three months from explant (Murashige and Skoog 1/3 with 2% sucrose). I still have a strange and and inexplicable fall of pH in the substrate after one day, but I'm handling it with an increase during preparation.
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Simply autoclaving media is sufficient to reduce the pH, through hydrolysis, among other some things; and virtually all media -- especially within the pH associated with the culture of carnivorous plants and orchids -- will become more acidic.
You may wish to increase your sucrose concentration, to 2.5, even 3%. I've rarely achieved or maintained stable pH at concentrations that low . . .