I feel your pain, Dieter.
I have a bait I made with a crooked bill because I left the line tie twist wire too long, and tried to force seat it when I set the lip. Of course, it moved. Grrrrr!!!!!
Now I drill an oversized and overdeep hole for the twist wire line tie under the lip, dry fit it several times until I'm sure it's not going to be under any strain, and then fill the hole and the lip slot with epoxy to set both the lip and the line tie in place. I cover the area next to the lip slot with blue tape, and use my finger, dipped in alcohol, to remove the epoxy squeeze out.
After I've gotten all the excess epoxy cleaned off, I recheck both the lip and the line tie to be sure they're centered.
Once that's set, I check again to be sure the line tie is centered. Now is the time to fine tune it if it's not.
Then I put blue masking tape around the line tie on top of the lip, so I can fill the drilled hole in the lip with epoxy, and then turn the bait on it's back, belly up, and lock both the line tie and the twist wire stem in place with D2T. I use my finger in alcohol to shape the epoxy around the twist wire. I've found that the twist wire doesn't have to be perfect in order for the bait to run true, and I haven't had it move when I've gotten bit.
It 'aint purdy sometimes, but it holds.