I like the 1, 3, 5 idea, but with less % resources harvest. Maybe 10/20/30/40/50. You dont really need THAT much meat late in the game and the bigger animals already give you much more meat than the small ones.
Another option would be
Lvl 1- tracking small animals
Lvl 2- 15% more resource harvesting
Lvl 3- track mid sized animals
Lvl 4- 30% more resource harvesting
Lvl 5- track big animals + 50% more harvesting. (rank 5 is always supposed to pack a bigger boom)
And since on A19 there's not need for a fixed 5 perk number.. it could also be tweaked to up to 4 ranks.
Rank 1 - track small animals +10% harvest
Rank 2 - + 25% harvest
Rank 3 - track mid-sized animals + 35% harvest
Rank 4 - track big animals + 50% more harvest.