I don't have data on the "pre-fire modern" custom format in my tournament database. This appears to be a player-created format that wouldn't be tracked in official tournament results.
However, I can help with your alternative request about Modern around 2019, before War of the Spark. Let me check what tournament data I have available for that time period.
I don't have sufficient tournament data to answer this question. My database doesn't contain Modern tournament results from 2019, so I cannot provide a tier list or winrate analysis for that time period.
For the "pre-fire modern" custom format, since it's a player-created format, it wouldn't appear in official tournament databases. You might want to check community resources like Reddit, Discord servers, or MTG content creators who may have tracked results for that specific format variant.
Sources: No tournament data available for the requested time period (2019).