Wheel pulling

Recently added the 15mm end caps to an All-City Go-Devil front hub on a WTB ST i23 and a WTB Prowler SL 2.1

Took it out for its first rest ride and out 14 miles and felt a serous wobble the going down hill and while trying to reach for my water bottle it felt like the bike was fighting me.

I can’t tell if the wheel is out of true, the tire isn’t seated properly or this is just an optical illusion on my old eyes.