Your pump seems to be working OK as the water going to the front wipers starts off as a single pipe which then branches off to each front window.
I know on my 2002 Export CD there is no gain in removing the wipers off the driving spline....nothing to see there...but the pipes can be traced back to the V junction plastic section where the pipes branch off...may be a blockage there.
I always use a small pin to clean out the small nipples and use the pin to swivel the nozzle around to hit the screen in the correct place...a pin can bend without breaking, do not use a sewing needle as these are brittle and can break off in the small nipple!
To remove wipers spray some WD 40 onto the spline then use a small bearing puller or place a block of wood near to the spline and use that as a base to pry the wipers off.
