Удаление не0 приоритетов записи MX

First, it's not clear what your end goal is here. If you want to have all your mail going to the webhost, then do what I say below. If you want your mail to go to google, then do the reverse - remove the web host MX. You need to choose one end destination for each mail domain.

A small bit of mail is going to google not because your web host is failing, but rather because some MTAs don't respect MX priority.

SMTP is very resilient to outages. Just remove the errant entries and all will be well. If the web host MX is down for a bit, sending MTAs will queue their mail and retry.