Did you use "development" branch, NEXT and you come out with kernel 4.14.40? I just made an image and it sometimes hangs on boot. I tried XU4 and HC1 ... I am still investigating what's wrong.
Well, we seek "board data maintainers" and Rock64 is free of duties, also Odroids It's little work but you need to be up2date with the board. Keep the data accurate here: https://www.armbian.com/rock64/, perhaps add some valuable info or links like https://www.armbian.com/pine64/ (but not that much) and keep that up to date. I am your backup in case you can't follow up or mixup something. You can recommend and rearrange recommended images, but they have to exist on the dl.armbian.com first. Stable images are done manually by me, while you can enable/disable beta images at any time and they are remade in next rebuild cycle. Usually in less than 24h.
CLI_BETA_TARGET="jessie,xenial,stretch,bionic:next"
This would build both Debian and both Ubuntu images with NEXT (4.14.y) kernel.
In case you are up for this, I'll make your login credentials to the webpage.