So.... We still only have access to unique players i.e. a team from each division cannot both draft the same player?
Spreading the wealth was meant to be the purpose of divisions I thought but if it can't be done then yes, reducing roster size is a must. Single RB, not sure including RB in flex would be good for fairness so I'd encourage only W/T there.
Personally I like the idea that division rankings would lead to playoffs regardless of overall position, just like conferences in the real NFL