i'm here to post a submission, but i agree sub 1L~ cases are OP.
(Liters^1.5)+1 might be enough to fix the issue. (then you're never dividing by a fraction).
Proposition:
(R23*TimeSpy / (Liters^1.5)+1 / 100
Examples:
petricor - (33,304*34,565 / (5^1.5)+1 / 100 = 945,090
chinevo - (12,775*2,688 / (0.251^1.5)+1 / 100 = 305,033
that aside, i set out months ago to break the PPL record with petricor's build in mind. of course, many have beaten this since - but i'm still very happy with my achievement.
i posted about this build here, and will post a full build log in coming.. months?.. as time and energy allow 
i copied petricors hardware (MOBO, RAM, CPU, etc.) as much as possible, but fit it all into a 3.3L S4T.
(it's a 4080s not a 4090 but pretty close).
due to power and heat constraints, the result is a build that barely squeaks out over his in PPL score!
| Case | S4T (Skyreach 4 Tiny) 3D Printed 2mm Thick Cover |
| PSU | HDPlex 250W GaN |
| CPU | Ryzen 9 7950x3D |
| GPU | 4080 Super |
| Cinebench R23 Multi-Core | 29,995 |
| TimeSpy Graphics Score | 22,358 |
Round 4 PPL Score
(29,995*22,358) / (3.3^1.5) / 100 | 1,118,692 |
