Dietary fiber intake is based on the IOM recommendation of 14g / 1,000kcal total energy.

The data used to establish the IOM's AI for potassium are actually rather weak. After reviewing the limited set of studies they considered, I see no compelling evidence favoring potassium intake in excess of 2.7g per day -- particularly in a dietary setting where sodium intake is tightly controlled (as with soylent).

The target ratio of ω-6 to ω-3 PUFA is between 2.3:1 and 1:1 (the standard American diet tends to be much higher). In addition, the ω-6 DRI is significantly reduced based on adequate ω-3 intake. For reference, studies have shown that ω-6 deficiencies are eliminated by 1-2% of calories as LA if the diet has no ω-3 (http://pmid.us/20102846), and by just 0.3% of calories as LA if the diet has over 1% ω-3 (http://pmid.us/14559071). Thus, a little ω-3 in the diet reduces the requirement for ω-6. The upper boundary is based on 10% of total energy from PUFA in all forms, which serves to limit the potential for oxidative stress from excessive PUFA intake (which remains a concern even when taken in carefully protected forms near the ideal ratio of ω-6 to ω-3).