One thing that makes the math not quite intuitive is the fact that no engine has zero vacuum @ WOT (the usual Holley formula produces 1.5" vacuum), so 5 psi boost is actually a 5.73 psi improvement (compared to NA).
Roots etc. which add fuel at the top (not Eaton which is EFI as OEM) also cool the charge as it vaporizes, no effective prediction on density. Even this is complicated:
1. very fine fuel atomization (annular venturis, big mains, big HSAB) cools most, but gas vapor displaces air mass. Also makes bigger explosions if you hang an exhaust valve!
2. large fuel droplets cool less, but subtract much less from air mass
How to tell which? Listen to your engine builder, or do A > B.