I did a bunch of work on this topic. Here were some of my notes:
Speed, Strength, Tackling as Majors:
CB:
Hard Hitter
5'10" - 6'3", 190-210 Lbs
Major Attributes: Speed, Strength, Tackling, Vision(+.5)
Minor Attributes: Agility, Confidence, Jumping, Stamina (+.25)
Favored Special Abilities: Closing Speed
Penalized Special Abilities: Change Direction
Combo Corner
5'8" - 6'3", 170-210 Lbs
Major Attributes: Agility, Speed, Strength, Tackling(+.5)
Minor Attributes: Vision, Confidence, Jumping, Stamina (+.25)
Favored Special Abilities: None
Penalized Special Abilities: None
DT:
Combo Tackle
6'0" - 6'8", 280-330 Lbs
Major Attributes: Speed, Strength, Tackling, Vision (+.5)
Minor Attributes: Agility, Confidence, Stamina (+.33)
Favored Special Abilities: None
Penalized Special Abilities: None
FS:
Hard Hitter
5'10" - 6'4", 195-220 Lbs
Major Attributes: Speed, Strength, Tackling, Vision (+.5
Minor Attributes: Agility, Confidence, Jumping, Stamina (+.25)
Favored Special Abilities: Big Hit
Penalized Special Abilities: Change Direction
Combo Safety
5'8" - 6'4", 185-220 Lbs
Major Attributes: Agility, Speed, Strength, Tackling (+.5)
Minor Attributes: Vision, Confidence, Jumping, Stamina (+.25)
Favored Special Abilities: None
Penalized Special Abilities: None
Combo Safety
5'9" - 6'5", 195-230 Lbs
Major Attributes: Agility, Speed, Strength, Tackling (+.5)
Minor Attributes: Vision, Confidence, Jumping, Stamina (+.25)
Favored Special Abilities: None
Penalized Special Abilities: None
After more analysis, I determined that on the D side, two Archetypes stood out:
Combo Tackle DT
6'0" - 6'8", 280-330 Lbs
Major Attributes: Speed, Strength, Tackling, Vision (+.5)
Minor Attributes: Agility, Confidence, Stamina (+.33)
Favored Special Abilities: None
Penalized Special Abilities: None
The Glare/Shed Blocks/Swat Ball/Strong Base/Big Sack
Wall/Break Thru/Snarl/Big Hit/D-Line General
Bonus SAs:
Monster Hit, Diving Tackle, Wrap Up Tackle, Headhunter, Change Direction, First Step
Pros:
Monster Hit as Bonus SA
Shed Blocks not penalized
280 - 330 lbs
6'0" to 6'8"
Cons:
No Change Direction or First Step
Shed Block requires investment in "The Glare"
Combo End DE
6'2" - 6'6", 260-300 Lbs
Major Attributes: Speed, Strength, Tackling, Vision (+.5)
Minor Attributes: Agility, Confidence, Stamina (+.33)
Favored Special Abilities: None
Penalized Special Abilities: None
Swat Ball/Wall/Strong Base/Diving Tackle/Monster Hit
First Step/Change Direction/Shed Block/Tunnel Vision/Big Sack
Bonus SAs:
Headhunter, Wrap Up Tackle, Big Hit
Pros:
FS/CD 1/2 in rusher SAs
No SA penalties
260-300 Lbs
6'2" - 6'6"
Cons:
Monster hit in last slot, swat ball and Strong Base in tree.
tl;dr version
If you want a great tackling STOP unit, build Combo DTs and DEs.
If you want a great blocking STOP unit, build Cs.