Clear coated though correct? You're working on a clear coat finish? The basecoat might be blue but you're actually working on clear paint?
but all that particular panel had was the megs heavy and medium cut compounds applied by a rotary turned down to 1200-1500 rpm.
Those products came out in the 1920's or 1930's and while they still have a strong following the problem with them is they are old school product originally intended to be used on single stage paints and when working on clear coats they will leave swirls in the paint UNTIL you follow them with a less aggressive cleaner/polish.
No, you just don't have enough steps in your process. These are both heavy cutters, buffing out paint isn't a grinding process, it's a polishing process, you need to follow these product with a less aggressive product and pad.
In the Meguiar's line that would be a cleaner/polish, that is a product that has some bite but not near as much as the M01 or M04
When you moved to the Menzerna PO 115C you were using a very light polish which is taking the place of a cleaner/polish in the Meguiar's line that most people would have used after the first to aggressive product you used.
It's not critical that you use a Meguiar's finishing polish just that you complete the process by using any company's finishing polish. Blaming the M01 and M04 for leaving your finish with swirls wasn't actually the products fault, they are not intended to leave a swirl free finish, they are formulated to be aggressive cutters to remove serious paint defects and then after using them the operator is supposed to follow them with a less aggressive product.
It being a finishing glaze I thought about giving it a try on a panel with swirls in it that Megs caused.
At this point, if the Menzerna PO 115C is removing the haze and swirls left by the Meguiar's product then keep going with it, if not then you probably need a more aggressive product like the PO85RD or maybe even something more aggressive, you won't know till you do a few test spots and then chemically strip your test spot and inspect.
Definitely don't go over the entire truck until you dial in a system that works to just one small section.
