• 2.9 baseline — 0.6 × season 3.2 (16 gm) + 0.4 × last 10 2.5
• −0.0 opponent leak — they concede 339.6/game vs a 344.9 league average
• +1.1 at this ground — averages 4 there (4 gm)
• vs them: averages 3.0 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.