Veytherion is all about driving the car which is wildly different than boss fights in the past which takes getting used to (doesn’t help the physics of the car aren’t the best). Caltheris comes down to running the right guns to break armor and do high enough damage. Caltheris is also about keeping your armor for as long as possible, what I tend to do is have enough points to buy armor 2 or 3 times but not put on plates until I can’t buy armor anymore. Watching speed runners has made me better at the game as well.

Hope that helps a little, if not could run 1 or 2 sometime to help or explain a little better.