i understand your frustration.
i would then suggest running your tab stock/rooted with stock recovery until, hear me out,
until you have done a mad amount of reading and learning for the following reason;
you are like looking at doing some HEAVY terminal work to diagnose/identify the full problem
and then MORE terminal work to fix it.
you will need to know for this problem how to use the dd command with respect to directly writing boot/kernel/recovery
images to appropriate mmcblk.
you will need to know what an mmcblk is and what mmcblk corresponds to recovery and boot.
you will need to learn how to disassemble debug and reconstruct boot/kernel/recovery images
you will need to learn to navigate your file system and mount,umount,remount,cd,cp,chmod,chown etc.
or if you reflash normal stock you can take it back to store and get a replacement.
Thank you so much for your patience and time