• 1.2 baseline — 0.6 × season 1.0 (20 gm) + 0.4 × last 10 1.5
• −0.2 opponent leak — they concede 26.6/game vs a 32.8 league average
• +0.1 at this ground — averages 1.3 there (21 gm)
• vs them: averages 1.1 over 7 games — evidence, never summed

Most signals here point under while you're on the over — worth reading the working above before you commit.

Derived, not measured — plain arithmetic over his real games, shown in full. Adjustments can overlap (a game at this ground can also be a wet one); they add simply, and this note is the admission.