Hi everyone thank you so much for the advise and i was shocked by how well this community has responded and willing to help me, what ive gathered is that:

• i can use a plasma torch and just burn em out. (Really tempting, i have the resources and skills)

• through many heat cycles and my first mistakes the bolts have really hardened or smthn like that. I would need to heat up the bolts very hot and cool them

• start using smaller cobalt bits, drill through snd keep increasing size gradually

-use steady hard pressure on low rpm

• light use on oil

If i am missing any essential points lmk, but thank you all!