I believe you would benefit from a hotter plate. A #6 plate should be mild/efficient with all the modifications you have done. I run a #6 plate with less modifications and I love it. I have less smoke then I did stock. Egts are low as well. If your ATS exh manifold was as rough as mine, I would do some smoothing and porting. Mine needed massive amounts of material removed. There were pockets of obstructive material that took me hours to remove. A fuel pump advance would also gain you a few free horses. What gear ratio are you running. I currently have 3. 55 gears which are way too tall for 35 inch tires. In order to put you back in your power band, I would go to 4. 10s. If your truck is primarily used for towing or off road, 4. 56 would be better. Just remember, with 4. 56, your top speed and fuel milage will suffer. If you tow very heavy, lower gears will actually improve fuel milage. I plan on going with 4. 10 gears. Your truck has some nice mods. Good luck