Two Weapon Fighting + Longsword / Shield

[CivvieWarrior20]

Probably been done to death but I am struggling with how Two Weapon Fightin/Improved Two Weapon Fighting and the various Shield feats interact (Shield Master, etc).

Level 12 core Fighter

Str Bonus +5

Two Weapon Fighting
Improved Two Weapon Fighting
Two Weapon Defence
Weapon Focus: Longsword
Weapon Focus: Heavy Shield
Shield Focus
Greater Shield Focus
Improved Shield Bash
Shield Master
Shield Slam

Weapon Training (Heavy Blades) +2
Weapon Training (Close - which includes shields) +1

+1 Longsword
+1 Heavy Shield

Hero Labs gave me the following attacks for dual wielding:

Longsword: +17/+12/+7 1d8+8
Heavy Shield: +20/+15 1d4+7

Does this mean when dual wielding my LS and Shield, I have 5 attacks - +17/+12/+7 (@ 1d8+8) and then +20/+15 (@ 1d4+7) - plus keeping my full shield AC while shield bashing?

[Lord Foul II]

seems legit

[Wonderstell]

Yup. Keep in mind that if you wield a light shield, or use the Shield-Trained trait, you would only take a -2 penalty to attacks from TWF on your Longsword attacks. Instead of the -4 penalty you have now.

[Claxon]

Honestly, if you go fully into the shield two weapon fighting feats, such as Shield Master, you realize that dual wielding shields is your best bet. But most people consider that to be kind of silly...so I would recommend using a light off-hand weapon such as a short sword and consider your shield to be your main weapon.

[Lelomenia]

I tend to miss obvious things, but it looks like you are getting full strength to offhand attack damage which I thought usually requires double slice or some such.