How I Finally Fixed Those Floor Gaps

Taboola passes site, site_id, campaign_id, campaign_item_id and click-id by default. Map those to your tracker's source/sub1-4 fields. Use {click_id} as your unique click identifier when posting back conversions.

?site={site}&site_id={site_id}&campaign_id={campaign_id}&campaign_item_id={campaign_item_id}&click-id={click_id}