How to Find Hiring Managers for a Specific Position with Clay

Anyone have a good way to find the hiring managers for a specific position using Clay? I'm using the LinkedIn and Apollo enrichment, submitting every title i could possibly think of and only 10-15% of them actually pull results. Even have a crazy example where I manually found the right contact, put their exact Job Title in the job title filter and it was still not pulling them. any help would be greatly appreciated!