I'd do a flow test then clean all injectors and do another flow test. Just
have some help and extinguishers around as already mentioned.

Get your hands on 4 baby food jars with lids.
Poke 3 holes in each lid, center large hole for the injector nozzle, 2
outside holes for a piece of stiff wire to fashion into a hanger. (and to
vent air)
Weigh each empty set up, record empty weights.
Insert nozzles into center holes, screw jar onto cover.
Run boost pump after your helpers have been awakened and armed with
extinguishers.
Weigh each jar, compare net fuel weights.
Clean, lather, rinse, repeat.
Jim