You are being SO gamey. This is going to set off red flags immediately.
Girls do not want to be picked up rigidly. They want to be charmed in a light laid back fashion.
I read your title "After opening, how to go from attraction to comfort". My answer to this is the same answer i give all my students, and that is, you dont build comfort, you bring it with you from the get-go! Attraction is also present from the moment you walk up to her...why? Because you should be feeling attraction towards her.
Instead of TRYING to get her attracted to you by pressing buttons and treating her like a cyborg, you should be focusing on being curious about her so you can find out if she is someone you want to continue speaking to.
Trust me when i say that, your opener...doesnt matter. How you are feeling when you open...does matter. Seduction is 3/4s curiosity.
Stop seeing the girl as a set, or as practice for openers....which is ridiculous. If you go out to practice opening....thats all you ever get....the opener. Go out to charm, connect with, and make women feel sexy!!
Pick up is not the way to do that!! You are awesome the way you already are, you just need some more beneficial ways of looking at women and interacting with them. Healthy ones....NOT pick up tactics. she is not a army that needs to be disarmed or manipulated.
Good luck,
Chris