Thanks @ABraun for sharing with us the results and for testing snap2stamps ! 
Just note that you have plotted the standard deviation of velocities ps_plot(‘vs’) and not the LOS deformation velocities ps_plot(‘v-d’) (minus DEM error). Maybe that plot is more likely what you are looking for.
Really glad to help users in making easier PSI using SNAP and StaMPS.
Still many things to be done and improved! 