You're probably not building your USB installer the proper way. No support for the tools here for the tools you chose to use so I can only suggest you switch to manual USB installer creation and a bootloader such as Enoch or Clover.
Can't help you on the AMD front as I've no such hardware hence no experience on such platforms with El Capitan and/or Sierra. But vanilla kernel = no go. You must use an AMD kerbnel. Look it up in the relevant AMD section and threads.
For Intel, again, can't answer unless you list your specs. Depending on your platform family, you may require AICPUPM patch or kernel patch to handle CPU power management and avoid KP/reboot.
Post your full computers specs (CPU, chipset, RAM, Graphics, LAN, wifi, bluetooth, SD card reader, audio exact models, ideally with PCI ids) and a copy of the bootpacks you've used (kexts, bootloader config files, etc.).