Ads galore on devices after installing. Is this to be expected? Does it need to run a few days?

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You don't appear to have much DNS traffic to the Pi-Hole, and it's likely that some of your clients are not using Pi-Hole for DNS. From your debug log:

  [2020-02-23 14:44:30.011 11882] Imported 136 queries from the long-term database
   [2020-02-23 14:44:30.012 11882]  -> Total DNS queries: 136
   [2020-02-23 14:44:30.012 11882]  -> Cached DNS queries: 14
   [2020-02-23 14:44:30.012 11882]  -> Forwarded DNS queries: 116
   [2020-02-23 14:44:30.012 11882]  -> Exactly blocked DNS queries: 4
   [2020-02-23 14:44:30.012 11882]  -> Unknown DNS queries: 2
   [2020-02-23 14:44:30.012 11882]  -> Unique domains: 36
   [2020-02-23 14:44:30.012 11882]  -> Unique clients: 3
   [2020-02-23 14:44:30.012 11882]  -> Known forward destinations: 2