Add more storage buffer capacity to tier-3 and larger Outposts

When you first repair an off-island site, an Oil Rig or Sawmill or Groundwater Well, so that it is useable, it counts as level 2 which I think of as tier-1. This allows using 1 or 2 shifts (the level presumably denotes the maximum number of shifts) and gives the site a storage capacity of around 1050 units.
Upgrading to tier-2 (or level 4, as the game calls it) gives a drastic increase in storage capacity, going from around 1050 to around 2400. That's very attractive.
I think something like this ought to continue. Currently it doen't. Upgrading from tier-2 to tier-3 only enlarges the site's storage buffer from around 2400 to around 2800, and so it keeps going, another 400 storage buffer per upgrade.
I'd really appreciate it if it went from 110 to 2400 to something like 3200, 4000, 4800, 6000, 7200. Having a larger site buffer gives greater flexibility, and that's often valuable.