Hello user Gimmick,
In your most recent rate, you have stated that moving 4 HP EVs into Def EVs for Tornadus-T would make it able to switch into Stealth Rock one more time, which would be true if one very important factor was not considered.
That factor is Tornadus-T's ability, Regenerator.
Regenerator allows Tornadus-T to switch into Stealth Rock as many times as it wants to, as it heals 33% of the pokemon's HP, while Stealth Rock only removes 25% from it. However, due to Tornadus-T's base hp, it reaches 300 HP once you give it 4 HP EVs, meaning that it'll heal itself 100 HP instead of 99 if you don't give it the EVs. Basically, 4 HP is much better on Tornadus-T!
Have a great day sir, and remember to always put the leftover 4 EVs on Tornadus-T in HP.