Your first mistake probably was that you did not format /data coming from Crombi. You just wiped it and that is not enough if you switch Android versions.
And then you made the cardinal mistake of using Wipe Data from the bootloader with a custom recovery installed. Don't beat yourself up too much though, you really could not know that unless you spent countless hours in these forums like I do.
But YOU probably have a life, so... it's fine, never mind 
My pet theory is that you have the Wipe Data command stuck on the misc partition. Each time you boot, the bootloader finds that command and calls the stock recovery to perform a wipe. Unfortunately nobody is home since you replaced it with TWRP, which makes a valiant attempt to comply and .... fails. Since the wipe does not happen, the command does not get erased and there you are in a nice little catch22.
There are two ways to go about this and we start with the easy one. We will overwrite the misc partition in adb shell, erasing the command, and next time you boot you should be able to boot to the bootloader and hopefully even into recovery. Don't even try to boot the rom at this point, that's a different problem.
If I am correct - it does happen once in a while - you would enter TWRP, properly format /data and then reflash the rom.
The end
Oh yeah, right! You need a couple of commands to get there!
The following will only work if you have a minute or two before TWRP reboots, if you do not have that much time we probably have to go another route, but for several reasons I want to try this first.
So test out at what point you have an adb connection. When you do, run these commands, hit enter at the end of each line (make sure you're running Windows as administrator!):
Code:
adb shell
killall -19 recovery
dd if=/dev/zero of=/dev/block/mmcblk0p3 bs=64 count=1
reboot
Have the dd command ready copied on your clipboard so that you can paste it. You do not want to rush typing dd commands!!! A tiny mistake can ruin what you left intact so far 
Be careful!
When the tablet reboots just hold the Vol Down button until you get to the bootloader. Enter recovery through RCK, then go to Wipe > Advanced > Format data > type "yes" and go have coffee. The formatting can take up to an hour. DO NOT RUN OUT OF JUICE.
Ok, try that and report back