Wow! That's pretty good already! It's hard to tell what kind of hints you need because the game is designed for you to discover them in a non-linear way. I can only help based on what I think is harder to find out. Spoilers ahoy:
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- You already have all six telephone contacts. The 'Who is who' is optional. In theory you can complete the podcast while missing one or two names/portraits. But you should end up collecting them all anyway.
- Did you get the post office document? It seems Hargrove goes by other names. Maybe this can help you get his police file?
- Avery knows a fair bit about Hargrove's relation with Evelyn.
Feel free to ask if you need specific advice!
Thanks for playing!