There are two ways to reduce the stress of Psi. Burst Stream and Programs. Both are rather advanced, but learning to use them can greatly reduce the mental stress of Psi. The ways are as follows:
Burst Stream: Burst Stream is a way of gaining control of and stopping an extremely powerful (and, thus, unstable) Burst without causing a large amount of mental fatigue for the user. By allowing the Burst power to stream into the atmosphere, by circulating it between the inside of outside of the user's body, the strain on the user's brain is greatly lessened.
Programs: By preparing a set of instructions in their mind before releasing their Burst PSI, PSI users can create programs that allow them to lessen the effects of using PSI on their minds and can gain a degree of control not otherwise obtainable. Forcibly stopping a program that is in motion creates a large amount of mental fatigue for the user so it is usually better to add an additional program while the first program is still running rather than trying to stop it altogether.
