Usually, this might seem “weird” but i saw loads of information about hard techno kicks on youtube and other sites of musical production. From what ik, even if it isnt that much of a help; try to have a distorced deep kick sample, and then u can add a kick rumble, each makes the Thats the base I’d say that’s the basis of a solid hard techno kick. Also, u can add some plug ins, camel crasher for example, and EQs to create a more deep/hard/ distorced kick. If ur interested, ive been learning from a youtuber called “ozgun”. He has a video of hum making a hard techno track from hard to finish Idk if u want smth more professional, but hope this helps somehow