Issues with adjusting inclination with asteroid

[ExpandDong]

I have been trying to adjust the inclination of an asteroid, but every time I try to use the normal and anti normal vectors,  I just make my orbit worse! How do I fix this?

[Kryxal]

What's better and what's worse?  Screenshots of your asteroid/ship combo and the current orbit would help, as well as what you're aiming to do.

[bewing]

When you thrust from your ship, does it drift away from being normal or anti-normal? If so, you either need to target the CoM of the asteroid better, or reduce your thrust.

Do you have some other probe core klawed to this asteroid? If so, you may have a "control point" problem. Try selecting the correct control point for your craft, and then using the "control from here" button.

[4x4cheesecake]

Also, you cannot burn normal or antinornal whenever you want, or at least, you shouldn't. To change the inclination, you want to burn at the ascending or descending node of the orbit. Otherwise, you are going to flip the orbit around in any direction but not the one you want. 

If you don't know it yet: the ascending and descending node is the point where your orbit crosses the equatorial plane of the planet/moon you are orbiting. This happens exactly two times. If your vessel is going to move up/in normal direction relative to the equatorial plane after crossing this point, it is the ascending nide, otherwise the descending node.

Burn anti-normal at the ascending node to decrease the inclination and normal if you want to increase it and vice versa on the descending node.

[ExpandDong]

Thank you guys for help. It has been awhile since I posted this, but I was able to adjust the inclination and  successfully dock it with my space station.