As posted many times, squeeze the crap out of the links with pliers. That usually does it. I have 2 buggies with perfectly free suspension sitting here and that's all it took. And I did it to someone else's RTR a couple weeks ago and it worked. If it doesn't, put some toothpaste or rubbing compound on the ball and use a drill to spin it in the link. If that doesn't work, you can sacrifice one of the balls and score the ball. You'll need a spare since you won't want to use that one any more. Spin it in the link with a drill. These are all old tricks. 8ight 3.0 isn't the first vehicle to have tight camber links.

Check your hinge pins for free A-arm movement also. If they don't move freely, just a light reaming with a drill bit should do it. I use the biggest bit that will fit easily into the A-arm hole. You're not looking to remove a bunch of material. Usually a quick spin does it. Again, old tricks.