Hey Marco, are you talkin 24 degrees per side? If so, no wonder it wont cut, thats an incredibly obtuse angle. Personally, I keep my knives at 15 degrees perside and lower, most at around 12 to 13 perside and they cut like razors. But sometimes the grind is too thick, like on the xm and if you go that low you'll have a huge bevel that looks dumb. You have to go of what the knife is used fir and hiw thick it is, take my Van heerden m16, uts about .014 on average so a 24 degree inclusive bevel looks thinner than most 30 to 40 degree bevels on thicker knives. And it cuts like a champ too, If you have any questions, you have my email, feel free to contact me anytime and I'll do my best to help you out. Take care my friend.
Alex.