[No Pepper]

From what I understand from previous posts or in the manual (can't find it now), is that Nation Quality only affects the frequency a player from that nation is created through drafts, discoveries, etc if that nation is set to appear in your league or universe. A player from the USA or one from the Philippines would have equal chance of having great ratings and a given player from the lower quality nation therefore could have higher ratings than an American just based on chance. Nation Quality, a misnomer in this sense, has no effect on the quality of a player's ratings. That is dictated by Player Creation/Sabermetric Modifiers that are set for your established leagues. Those settings can be found in your individual league's settings page and you'd have to set them up differently to create a difference in average player ratings between the two leagues.