Seeking advice on how to extract broken lug bolts

If those backed out with the LH drill bits, I'd suggest review of the torque spec. Seems like they might've been overtightened at some point in the past. Glad you got em out!
Thank you. I do have a service manual, so I'll reference it and double check.

I think I get what you're saying -- I was slightly surprised at how easily they backed out, even with the heat and penetrant.