Ah, ok! One thing I found out when doing my own thing, is that ratings from 200-250 are "exclusive" to players that are very very good at something so I'd suggest to adjust your formula to: =ROUND(200*(
[FIFA SCORE]/100),0), this way the created players will still be as good but they won't all have legendary status.
For example, here's Martin Odegaard from my save: His best ratings are an 86 Gap and 81 Power (I set 100% accuracy while I create the players). However, when we check the editor we can see he only has a 171 gap and 161 power. With your formula (250*(86/100)), he'd get a 215 gap rating in the editor, which would result in him getting a 100/100 (or 80/80) rating in the normal screen, just like your players are getting .