This file also comes with a series of supports that I would not leave out. I pepped this file three times before I got it right. The first was too small, the second I left out the supports and it warped severly during resining, the third I did with all supports. The third one is the one found in my Mk VI build, so obviously it turned out ok. With any helmet or any pep, if there is a support, use it. Supports help the pep retain its shape and prevent warping when resining.
Your pepping skill is pretty solid (a bit brave for taking this helmet on without tab numbers). Keep up the good work.