Your PC with Ultimate Compound and an Orange Pad is more than adequate to correct almost any paint.
You are correct when you suppose that it is technique related.
With a PC it is very important that you mark you backing plate and make sure it is always rotating.
To get more cut out of the
products you already have, you can adjust the following variables:
- Increase Downward Pressure
- Higher number of Passes
- Slower Passes
- Increase Speed Setting on the PC
Here is a tutorial by Mike Phillips that includes a video and focuses on maximizing the capabilities of the PC:
Dual Action Orbital Polisher Guide: how to remove swirls, scratches, & oxidation with an orbital buffer. Porter Cable 7424, foam pads, backing plate,
Have Fun, you will get it done with what you have