Pressure tanks for RO storage, are equipped with larger bladders since the pressure range is greater than for a well pump pressure tank. When empty, the RO tank precharge is typically preset to 6-7 psi, and the pressure when filled, is normally 60% - 65% of the feed pressure.
An electric booster pump may be utilized to boost the feed pressure to approx 80 psi when the feed pressure is too low.
As I seem to recall, your water source is municipal so your home pressure is likely ~60 psi. With 60 psi feed pressure, the pressure at the RO faucet should be about 36 - 40 psi when the storage tank is full. Increasing the tank precharge will increase the pressure when the tank is almost empty, but the maximum pressure will continue to be 36-40 psi as governed by the RO's Automatic Shutoff Valve.
A further option to increase the pressure at the RO faucet and also increase system efficiency is to install a Permeate Pump after the RO membrane. A permeate pump will use the energy of the wastewater to pump the permeate (RO water) from the membrane into the pressure tank.
Since the membrane will not need to overcome back pressure from the storage tank, water production will be higher so the storage tank will fill faster and the system will not need to run as long each day for the same water volume. The quality of RO water will also be higher. Because the membrane will be isolated from the pressure in the storage tank, the system pressure may be increased up to 90-95% of feed pressure.
Here is an animation showing the operation of a permeate pump:
https://www.permeate-pump.com/ERP1000ben.htm