ToME: the Tales of Maj'Eyal

In which order is the psi gain, that Solipsist get by putting points into willpower calculated? (considering that the Solipsism talents boost the psi per point amount)

Does the amount of Psi get re-adjusted retroactively for all the willpower points, when I unlook balance/clarity/dismissal or do these 0,5 bonuses only come into effect for any future points that I put into willpower?

It is retrospective. Not sure the order matters.

thank you!