Subtle Hover Design Ideas

I'm using tooltips on my site to show some extra info but i'm finding it hard to make it obvious that the icons are hoverable. I have added in a swirl line that animates, also a pulse animation to the icon itself and have changed the curser to '?' when the icon is hovered however when doing some testing in the company it's clear it is not obvious enough.

I have attached an image of the section in question.

I would like to avoid having 'Hover me' on the page.

Any suggestions would be great, thanks.