I have the same hydraulic tool and had the same bad luck with stainless. IF (means about 20% of the time) I could hold the stainless, the stuff cracked when I did the second flare of the double. If it didnt, I screwed up the other end of the tube. If I got one that looked about right, it leaked when I installed it unless I put a monster torque on the fittings. I finally gave up and bought pre-made lengths, cut one end off to the right length and flared that. Worked fine.