Okay, so your basic recipe has some issues.
Frytol, according to what I see on the internet, is a mix of rapeseed, palm, and sunflower oils. I calculated your recipe several ways and the highest KOH weight I've gotten is about 35 grams to saponify 150 grams of Frytol. That 35 g KOH is based on assuming the Frytol is all palm oil (of the three fats, palm has the highest saponification value of about 0.142), 0% superfat, and 85% KOH purity.
Did you check this recipe using a so@p recipe calculator? If you used someone else's recipe without verifying the numbers, did that recipe call for adding an acid to neutralize the excess KOH? In other words, where did the 50 gram weight come from?
A 3:1 water:lye ratio (25% lye concentration) is fine for making liquid soap, so the 150 g water you used seems reasonable when using 50 g KOH.
Don't dilute with salt water. Dilute with PLAIN water, no salt. Salt is for thickening soap, not for diluting it. By using salt water, you're trying to dilute the soap paste and thicken it all at the same time. This will not work. Dilute first. Thicken after dilution.
Also are you using table salt -- sodium chloride, NaCl? Or another type of salt?