When I was a prosecutor, I had a similar issue. I had a post-appeal sentencing on a triple murder case where the guy got his LWOP sentence vacated. The trial judge on remand could have made the findings to give him LWOP anyway, but said he couldn’t make the necessary findings. I said, OK, fine...
Three murders, maxed and stacked, with the other crimes too. 248 years.
The judge gave him 248 years. If he’s a good boy, he’ll be out in 124.
Do the same here. Fifty years per victim, stack them, you get 500 years.
Seems that you did a good job.