What was the reasoning to leaving the cedars? I'd cut them all down. All they are going to do is continue to spread and in 10 years you'll be right back where you started. The ones standing look like they've had the lower branches removed. I don't see deer using it for bedding if it is no longer thick. I'd burn all the mulch if you can. If it won't burn I'd add lime and as much wood ash as you can before discing it all up. I did a similar project with MDC. Removed 12 acres of cedars, stumps and all. MDC wanted the stumps left in the field but we ripped them out. After a year you'd have never known there was ever a cedar there.Nothing but native grass and wildflowers. Beautiful glade that the turkey and doves love. I keep wishing some quail will find it. If nothing comes up I'd buy some wildflower /native grass glade mix or plant clover.