size of wp_queue is inordinately large

Hello,

I have the same problem like described in this thread:
https://github.com/mailchimp/mc-woocommerce/issues/170

resyncing helped to clear the database but it runs full again after. This constatntly causes our server to crash.
Can you please provide a solution for this?
I only need the mail address + name to be synced and no other information.

Thank you