New AOSP-Ex Rom won't load, please help - Kindle Fire HDX 7" & 8.9" Q&A, Help & Troubleshoot

Hello. I own a kindle fire HDX 7 (Thor) with a bootloader installed, but can't install the new rom. I wipe first, then install the rom, and finally gapps. After resetting and pressing continue to skip the recovery, the screen just stays black until it fails and I reset my device back into recovery.
Anyone know what I may be missing?
Thanks!
Edit: the recovery installed is Safestrap 4.01 (TWRP v2.7.1.0). I'm kind of confused as to whether this is safestrap or trwp.

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Safestrap isnt the same as TWRP, if you have Safetrap ,you are limited to bootloader locked ROM's like FireNexus KK, you need unlock the bootloader to get full TWRP recovery
Every single ROM needs a minimum recovery build installed to get flashed properly, if my memory dont fail, Marshmallow and Nougat ROM's, needs TWRP version 3.0 or newer ,otherwise thats why you cant install it.
If you have TWRP, you can upgrade using Flashify,start the system, downaload Flashify from Google Play, open it, and use recovery option to replace old TWRP, just grab the new TWRP (search in the forums the links) replace it and reboot, and its done
But check first first which recovery are you install, replace Safetrap with TWRP without unlocked bootloader , will brick your device
This is a TWRP recover screen
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
And this is Safestrap

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Yousucks2 said:
Safestrap isnt the same as TWRP, if you have Safetrap ,you are limited to bootloader locked ROM's like FireNexus KK, you need unlock the bootloader to get full TWRP recovery
If the ROM have Marshmallow or Nougat core, you need a newer version of TWRP, version 3.0 or newer ,otherwise thats why you cant install it.
If you have TWRP you can upgrade using Flashify,start the system, downaload Flashify, open it, and open recovery option, just grab the new TWRP (search in the forums the links) replace it and reboot, and its done
But check first first which recovery are you install, replace Safetrap with TWRP without unlocked bootloader , will brick your device
Click to expand...
Click to collapse
Excellent response!
@leeismyname - I happen to be helping another member through unlocking the bootloader (here). Feel free to tag along. Just be sure to use the "Thor" (7" HDX) vs "Apollo" (8.9" HDX) files when installing the vulnerable aboot (bootloader) and TWRP. Ask questions in that thread as needed.

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Thank you both for your timely and informative responses! From the pictures, I know I have safestrap. Time to piggy back off Davey's other thread!