I hate to say that but: From realism point of view…
Extremalay Min/Max characters are pretty useless. what sport can human with 18/4/4/4 stats do IRL?
High strenght? weightlifting, nothing more without dexterity/speed.
Dexterity? Darts, i guess. Acrobatics need strenght, snooker need INT.
INT? chess or bridge. Sport poker needs PER.
PER? hmm, no idea, but it would be very valuable in hunter-gatherer community 
Anyway, my point is that 18/4/4/4 should be always suboptimal choice, whatever it means. perhaps better than basic 8/8/8/8, but worse that some 14/10/4/4, or 12/12/4/4.
As for PER, Overmap range sounds nice. Maybe some more info about Blinking Z Hordes? size , strongest enemy, something like that. And large game visible from overmap (would be usefull for hunting). better PER = higher range of bonus information.
Better chance for Headshot - cool. Maybe also better chance for special attacks in melee, both from weapons and from fighting styles (you see more opportunities to attack).
Limited Item data is cool too - you can see exact item name from short distance, only category from medium (like “pistol”, “drug”, “plastic bottle”), and not visible from large distance. Visibility should be modified by volume of item (you’ll see fridge from kilometer, but not credit card…), perhaps total volume of all items in a field (…but stack of 1000 cards should be visible from afar), light conditions , terrain type…
In other words, PER is not a first choice, but add some twist (possibilities and/or bonuses) as second/third stat.