• 6.3 baseline — 0.6 × season 6.4 (14 gm) + 0.4 × last 10 6.1
• −0.3 opponent leak — they concede 89.3/game vs a 93.4 league average
• −0.9 at this ground — averages 5.4 there (74 gm)
• vs them: averages 4.4 over 8 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.