slave cylinder on the right way round (nipple at the top),if it splasahes back in resevoir when pedal pumped may mean master cylinder seals are leaking ,is there good fluid flow from slave ?
Had it put back together and slave cylinder is on right way but not getting much fluid out so going to try a second hand one tomorrow from scrap yard fingers crossed.
often you need to remove pipe of master and place finger over the end ,remove finger as pedal is pressed doen and cover hole tightly when pedal is lifted ,till fluid flows well then refit pipe and slacken when pedal is pressed and tighten before pedal is let up,then do same with bleed nipple