Painted into a corner, Need advice on how to do it Options

[worn]

Hi to all, especially you experts with a spray gun. I know who some of you are, and you know whom the other are.

I have now painted a few cars and since I stick to single stage and can color sand, it has worked out pretty well. Especially the easy parts.

What I haven't figured out is how to deal with inside corners. I understand that physics is against me, in that a ball or beam of light hitting a ninety degree inside corner wil come straight back at the sender. On inside corners, I sometimes cannot get coverage unless I settle for granular balls of paint that settle in the region. Tightening the pattern by closing the side jets that make the brush pattern for the gun seems to help as does using the smallest gun possible. I suspect though that expert advice would be better than my muddling through. Winter is closing in fast, so you have till spring to answer. Still, realistically you will have forgotten long before that, so please help me now instead.
I am using bare metal, covered with DP50, followed by K36 sanded, followed by Deltron. It is Bahia red, so it looks pretty much like a major crime scene when the paint is flowing. Thanks folks!! You are amazing people.