the best way to counter a shovel is to use an opener that will allow you to grab their arms first turn.
I don't remember the exact opener I used but I believe contracted wrists, abs, hips and pecs, held shoulders, and extended glutes should do the trick. then next turn hold alland keep your balance. possibly extend your hips and raise your shoulders just make sure you keep their hands away from your body.
maybe get a friend to shovel you in a private server and practice this until you work it out.
I haven't played in a while so the opener could be a bit off and you may have to tweak it a bit. Best of luck.