Only four are familiar to me, so I would say Peter Gilmour, Vinnie Lane, and Morbid Angel can be bumped up a little higher since they have not only been in XwF the longest, but also have been consistent and very talented writers. I feel like unknown soldier is at a perfect place, so he can stay. Sorry I couldn't be more assistance.

Edit: In addition to the three I proposed get bumped, I think there is a chance we could remove somebody who has done slightly less than Scully. I feel Scully should at least be somewhere between the top 40 to 50.