Backtest Lab is a model inspection surface, not the public tracked-results ledger. It is most useful for comparing parameter sets against the same stored fight, result and odds pool.
All model leans treats every usable directional lean as a one-unit strategy bet. Value/advantage modes add a market-difference requirement before a lean becomes a simulated bet.
Time Safe: On (strict) is the cleanest audit mode. It applies pre-fight as-of filtering and disables objective inputs that cannot be calculated without strict leakage risk.
Time Safe: On (non-strict) keeps the same public-result candidate pool, but permits approved objective-derived exceptions for targeted lab models or custom selections. Off is broader exploration and may include non-time-safe historical inputs.
For serious model comparison, change one lens at a time: strategy, market bucket, confidence tier, time-safety mode, or objective history window. The useful signal is usually the pattern across runs, not one isolated ROI cell.