First post on the forum, I’m a little nervous
Lol jokes aside, I’m working on a teapot spout but I’m having a couple problems in the modeling process so I’d really appreciate any help.
For reference, this is what I’m trying to model (with some minor adjustments)

Problem 1: There’s a slight waver on the sides of the spout and ideally, it would be straight
I used these primitive surfaces (plus the outer wall of the teapot) to trim the object into shape.
I spent a while messing around with the control points to try and align them manually, but I’m wondering if maybe this approach isn’t the best for the shape I’m trying to model?
Problem 2: Zebra map is a little weird where the two surfaces meet
I know it’s somewhat possible since a previous version of the spout looked like this:
My design constraints are:
And the thickness is 3mm with 1.5mm radius fillets.
Any advice is appreciated!
(Edit: added an image)