You stopped adding to speed too soon. Should have took it to 83+, then agility and carry. Should have waited on stamina also.Top 4 you should be focused on is speed/agility/carry/strength. Some say vision, but I think it's overrated on a returner. Here is my level 42 KR/PR
Strength:49.82
Blocking:6
Speed:126.09 (+29)
Tackling:8
Agility:80.09
Throwing:8
Jumping:18.82
Catching:8
Stamina:27.09
Carrying:53.09
Vision:21.09
Kicking:8
Confidence:20.82
Punting:8