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The B path is just Sho never visiting his mom. Whatever you choose as Saya's advice Is something else, not another route of it's own. I get that Yuu said he felt uncomfortable in the C route without the  need of Saya's advice, but in the A and B paths, just ask Saya for relationship advice, simple as that.

The routes are good, neutral, and bad for a reason. 

Good: Sho visits his mom. This is A.                   Neutral: nothing happens. This is B.                 Bad: Sho quarrels with Yuu. This is C.

The developer said the "Saya's advice" desicion will most likely only affect the route until nearly the end of the game (whenever that will be), which means there may be A 1 and 2, and B 1 and 2. As stated before, Saya's advice is it's own thing separate from the 3 important choices in Sho's route. I really hope its stays as A 1 and 2 and B 1 and 2, because having endings A - E may be a bit overwhelming (not just on the players, but on the developer themselves as well).

I think you misunderstood, the uncomfortable is not B.

A:Succeed at convincing Shoichi (good)

B:Leave it be (neutral)

C:get yelled at (bad) 

The uncomfortable part comes after the path split, meaning that we can mark it as A2 or B2. So  that technically means that C is still the bad route regardless.