Issue with Low Contact Returns from 30k UK Companies List

Hello.. Quick question: In a workbook I've got a table with 30k UK based companies that fit our ICP. I have a Find People table that is set to add sales and marketing related contacts from the list of 30k companies. But I am only getting around 1.7k contacts in total which I find quite hard to believe! Especially as we have up to 5 contacts per company and so the number of companies that have returned a result is a fraction. I'm on Pro package and so should get up to 50k results. Any ideas on what might be going on? thanks