Moisture content for flours probably varies, as it does with rice, etc.
I have a recipe for BBQ sauce that I've converted to weights. Not by a conversion chart but by once measuring as directed and then checking the weight of each of the measured (in cups) ingredients.
Cups are doable, but when it all is going in the same pot, it's easier (and fewer things to wash) to put the pan on the scale, zero it out, and then pour in 55-60g of this, zero it again and then so many grams of that, and so on.