• 7.1 baseline — 0.6 × season 6.4 (18 gm) + 0.4 × last 10 8.0
• −0.2 opponent leak — they concede 207.8/game vs a 213.6 league average
• −1.9 at this ground — averages 5.2 there (14 gm)
• vs them: averages 2.0 over 1 game — 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.