With TST, you'll get more... but you are out of air by then... close to 700 you'll get tuned right, but not quite... more air with that combo will get you over 700.
And???
Look, the question was about what is in your sig and flux 3's. Others with 4's have made 800, or close to it. I made mid 700's with 3's... it is not what I did, or your friend or anyone else... it is about what you can do. you want to expand the scope of mods, then you'll do more...