get a sidemarker light bulb with leads coming off it and stick it into an injector clip while trying to crank it (cheap noid light). it should pulse/light up if the injectors are actually getting power (check each one).

did you pull the rail w/ the injectors still in it to see if they actually spray fuel while cranking? not ideal, but i would try this as last resort. do it outside w/o any ingnition sources/smokers around.