You always have to raise the coupled TV/TT, that's how you put tension on the spring bars. How much tension you need will determine how high you need to raise the TV/TT. It comes down to how heavy the tongue weight is and what you're using for a TV. You need to concentrate on returning the front of the TV to or near it's original height.
As an FYI I had a 2010 F150 Max Tow and a TT with a 900-950lb TW. I had to raise the coupled TV/TT about 4-6" to get the spring bars seated. I was using an EQ with 1200lb bars. Don't get all hung up on how much you have to raise the TV/TT, it's common practice as it's how you put tension on the spring bars and transfer weight. If you're not lifting the TV/TT then you're not setup right.