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I have read through several posts on this topic already, but I'm not able to see anything that points me in the right direction. I have an IP reservation for my pi (this seems like a common issue).
Expected Behaviour:
Ads blocked.
Actual Behaviour:
Very few ads blocked. I don't notice anything being blocked, but the web interface says that there are some ads being blocked.
Your debug log shows no problems with Pi-Hole that keeps it from blocking ads. In particular, this section of your debug log shows that it is working properly resolving DNS queries.
*** [ DIAGNOSING ]: Name resolution (IPv4) using a random blocked domain and a known ad-serving domain
[✓] adwarehitman.com is 0.0.0.0 via localhost (127.0.0.1)
[✓] adwarehitman.com is 0.0.0.0 via Pi-hole (192.168.0.13)
[✓] doubleclick.com is 172.217.4.206 via a remote, public DNS server (8.8.8.8)
This problem is likely due to another DNS path to a third party DNS either on your router or client(s). With two DNS entries, the DNS traffic will go to both; some will go to Pi-Hole and some will bypass the Pi-Hole.
A quick way to check this is to use a client (desktop or laptop is usually a good choice), and assign that client with a manual DNS of Pi-Hole IP and nothing else. Clear the DNS cache on that client and then tail the pihole.log (Web Admin GUI > Tools > Tail pihole.log) and see if the traffic from that client is getting to the Pi-Hole.