That panel was punched for Switchcraft connectors, that's why the Neutrik XLR are straight because they are the P series designed to fit into Switchcraft punched chassis.
Yea I would go crazy as well!!!
I solder XLR and Speakon chassis connectors, and have been using the Neutrik SCDR boots on the backof them many times and always use them on the back of a Powercon.
https://www.neutrik.com/en/product/scdr
Scott and Mike, I did consider it, but the thought of re-drilling the panel, or the connectors with holes so close (or even overlapping) just didn't interest me for a 5 degree mounting difference.... Soooo, crooked they are.
All connections on he I/O panel are soldered, with the appropriate connectors on the end of each cable.
The way I wired the XLR's, there is Input A and B to the crossover, and a separate input direct to each side of the MX-1500. Sometimes i rented extra boxes that were full range, so no screwing around inside the rack. Plug and play. On the Neutrics, output 1+ and 1- was the 1500, 2+ and 2- the Peavey.
It's only been working fine for 25 years......
Chris.