Creasing doesn't affect the 2nd turbosmooth you added, it'll just subD smooth the geometry that is the end result of the first turbosmooth modifier. That's the expected result in this situation - which is loose control loops not holding the shape you wanted it to.
I might personally inset the shape to be cutout of that cylinder and not just add loops and delete the shape from the cylinder. Like this but probably with different amount of segements on the cylinder(I just started with what you had after you did the first turbosmooth so skipped that stage) https://www.youtube.com/watch?v=Mi4RIq9L_EU&feature=youtu.be
But you can probably slide some of those loops closer to the red lines to tighten up the edges pulling out from the edges too far and might be ok. https://i.imgur.com/MR2fAqm.jpg
Creasing doesn't affect the 2nd turbosmooth you added, it'll just subD smooth the geometry that is the end result of the first turbosmooth modifier. That's the expected result in this situation - which is loose control loops not holding the shape you wanted it to.
I might personally inset the shape to be cutout of that cylinder and not just add loops and delete the shape from the cylinder. Like this but probably with different amount of segements on the cylinder(I just started with what you had after you did the first turbosmooth so skipped that stage) https://www.youtube.com/watch?v=Mi4RIq9L_EU&feature=youtu.be
But you can probably slide some of those loops closer to the red lines to tighten up the edges pulling out from the edges too far and might be ok. https://i.imgur.com/MR2fAqm.jpg
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I might personally inset the shape to be cutout of that cylinder and not just add loops and delete the shape from the cylinder. Like this but probably with different amount of segements on the cylinder(I just started with what you had after you did the first turbosmooth so skipped that stage)
https://www.youtube.com/watch?v=Mi4RIq9L_EU&feature=youtu.be
But you can probably slide some of those loops closer to the red lines to tighten up the edges pulling out from the edges too far and might be ok. https://i.imgur.com/MR2fAqm.jpg