In my opinion when we're talking low pop on both sides as well as one side being ratioed. This condition ought to be treated more so as a "seeding phase". With the objective of trying to help "kindle the flame" by making it less painful for people on the receiving end.
What ends up happening is players are trickling in on one side and getting ran over repeatedly. Spawn camped and whatnot. Then people just end up leaving. While the next person joins gets thrashed and then leaves.
- Introduce a dynamic grace period that protects the kits/supply after spawning. That extends beyond just protecting spawn camping. Allowing for more reckless-play from the lower pop side. Allowing them to throw themselves into a fight/CP without having to worry as much about losing their supply and tippytoeing trying to fight against often 3 to 1 odds.
In a overall low population server on top of one team being ratioed. The team that is getting ratioed shouldn't be running out of supply and they often do ever time because you're getting camped often.
- Maybe more controversial but I'd just make it so F2P has full access in extreme low server pop conditions and ratioed. At least for infantry kits. Something that is dynamically enabled to help seed the lower pop side. (Let me be clear, this would be for extreme conditions)
I seed for other games like game-Squad and servers often will give you some kind of perk like giving you some VIP-queue if you've spent enough hours helping to seed. So you don't have to wait in queue to join during prime hours. While normally you'd have to pay the server owners for VIP.
Imo, during extreme conditions that same attitude could to be applied here. You're basically rewarding people for sticking around in abnormal server conditions that doesn't reflect peak hour gameplay.