We always get our hyd f.t. cams ground on steel cores at an extra cost or pay for the extra nitride process on cast cams.
I paid the extra money for the nitride process twice and they lasted an extra 5 minutes. So the last time I bought the steel core and the tool steel lifters.
I have a Comp XE292 hyd f.t. in my Charger. I broke it in with outer springs only. After break in I put the inner springs back in and has been fine since. I have around 55,000 miles on it so far.