pathfinder homebrew TWF feat chain

Two-Weapon Fighting:
Req: Dex 15 or Str 15
When wielding a second weapon in your off-hand, you may make an attack with it as part of a standard attack action at your highest base attack bonus. You do not apply your Strength bonus to your off-hand damage roll. Using this feat requires that both weapons wielded be one-handed or light. All attacks you make are at a -2 penalty until the end of your turn when using this option. Vital Strike cannot be applied to this attack, though it can be made in addition to the Vital Strike attack. Haste and similar effects do not grant an additional off-hand attack. Use of this feat ignores the normal penalties for Two-Weapon Fighting combat.
Special: If you have multiple off-hand weapons, you may make an extra attack with only one of them as part of a standard attack action, or with each as part of a full-round attack. Additionally, if you are capable of wielding a 2h weapon and at least one other weapon, or multiple 2h weapons, it counts as a 1h weapon for the purposes of this feat.

Improved Two-Weapon Fighting:
Req: Dex 17 or Str 17, Two-Weapon Fighting, BAB +6
When taking the full attack action with two or more weapons, you may make an additional number of attacks with your off-hand weapons based on your base attack bonus. These attacks are in addition to your normal iterative attacks. Haste and similar effects do not grant an additional off-hand attack. Use of this feat ignores the normal penalties for Two-Weapon Fighting combat.
BAB      # of Off-Hand attacks    # of Multiweapon Off-Hand attacks
+6       2 (+6/+1)                      3 (+6/+1/+1)
+11      3 (+11/+6/+6)                  4 (+11/+6/+6/+6)
+16      4 (+16/+11/+11/+11)            5 (+16/+11/+11/+11/+11)
Special: If you have multiple off-hand weapons, these extra attacks may be made with any of them.

Greater Two-Weapon Fighting:
Req: Dex 19 or Str 19, Two-Weapon Fighting, Improved Two-Weapon Fighting, BAB +11
When using two-weapon fighting, you do not take the -2 penalty from Two-Weapon Fighting to your attacks. Additionally, you gain one additional attack at your highest base attack bonus with your off-hand weapon when using the full-attack action.
Special: If you have multiple off-hand weapons, this extra attack may be made with any of them. Use of this feat ignores the normal penalties for Two-Weapon Fighting combat.