Re: initial high current
what you probably have is a capacitor directlly across the power rails, so when it powers up you have a huge current surge.
use a LC filter , this will limit the high freq current surge.
something like
--!---L--!------ PWR
C1 C2
--!-------!------GND
c1 small, C2 is the huge cap you already have.
there are other ways to do it, but they reduce the efficiency of the converter, hence whether you use em or not is up to you.
L is main compoentns here as cant have instant current through it.