it would be better to make them different than the 18 yo drafted one season before
That makes sense. I would prefer it this way too.
i still believe that we should just have a bigger % of top 19 yo, 70-80 TSP)
This is the desired effect, yeah. 9.49 instead of 8.99 would achieve just that and it would make players look better visually without too much effective improvement. See this way displayed TSP will increase by 4-6 points on avg but real TSP would only increase by 2-3 pts (for the 60+ TSP guys that is).
BBB: 2 (S37 S38); Top tier: 7 (S35 S36 S37 S38 S39 S41 S63); Cup: 9 (S25 S35 S36 S37 S38 S39 S40 S41 S61)