Less Mass But No Theoretical Mass

The diagram below shows the case when $x_z$ is small,

For $\psi$ to exist, $F$ is negative for values of $x\lt x_z$, this would imply that when two positive charges are brought very close together they would attract each other and stick.

Otherwise the mass of a positive is just the mass of the particle along time $t_c$ when $x_z=0$,

$m_{po}=m$

and

$m_{\rho\,e} c^2=m_\rho c^2-\int^{x_a}_{0}{\psi}dx=m_{\rho\,po} c^2-\int^{x_a}_{0}{\psi}dx=m_{\rho\,po} c^2-\int^{2x_z}_{0}{\psi}dx$

In both cases,

$m_{\rho\,e}\lt m_{\rho\,po}$

because

$x_{z\,po}\lt x_{z\,e}$

that more of the $F$ curve associated with a negative charge is negative, than the $F$ curve associated with a positive charge.