hey, don't get me wrong, you should be able to figure it out and get it to print.
tunnelling happens with too much squeegee pressure on an auto. if you don't bring the blade down evenly from a 'no pressure' position, sometimes on side isn't printing, and you over compensate, and then it loosl ike the other side isn;t printing so you crank it more. next thing the blade is bowing and not making contact. Further pressure just bows it more.
How much is the correct pressure? just enough.
Have you got some S0-34 cleaner? (TW) I mix 20% in with water and use this for startup lube, and for cleaning during the run if stuff dries in. use a spritzer and a soft sponge.
Really wet the screen at the start, and print fast as you adjust the pressure.