Help- need chemist on crystal vs anhydrous K2CO3

I've been fooling with Crawley's FX-2, which seems to have some really nice properties, but I've forgotten most of my chemistry. The conversion from anhydrous to mono Sodium Carbonate is well known, but this formula uses Potassium Carbonate. My old chem handbook lists the formula weights as 138.21 for the anhydrous and 330.47 for the crystalline form with 3H20. Anchell says the crystalline form is 1.5H20 and doesn't give a conversion. Hmmmm. FX-2 uses crystalline, so do I multiply the quantity by .418 if I use anhydrous, or is there another form I don't have a formula weight for? Also, what's this business about a bicarbonate buffer depending on what grade you buy? Does it matter in the developer? Help! I need a chemist.

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