https://backpack.tf/profiles/76561198867208675#!/compare/1745452800/1745539200 - Bulk sale

The Cotton Head has an outdated price, and it has no recent sales, so 320 isn't a good price to use for it. It does have a stable buy order at 300 Keys.

https://imgur.com/a/VV4zrIq

The Ravenous Ravens Shadow Shroud has other sales that should be looked at.

https://backpack.tf/profiles/76561198048724906#!/compare/1744675200/1745193600 - 149 Keys match here

https://backpack.tf/profiles/76561198095830651#!/compare/1744588800/1745539200 - Below buy order price

https://backpack.tf/profiles/76561198367892937#!/compare/1740700800/1740787200 - The Shroud would be <130 Keys here

https://backpack.tf/profiles/76561198045749377#!/compare/1741305600/1741737600 - ~99 Keys in Items

https://backpack.tf/profiles/76561198088591924#!/compare/1746921600/1747008000 - The Spy-Cicle sold for 15 Keys here

https://backpack.tf/profiles/76561198258937500#!/compare/1741737600/1741910400 - ?

These sales make your Ravens Shroud purchase look high.

99 - 149 would average to 124 Keys for the Ravens Shroud. That + 300 Keys from the Cotton Head buyer makes your Purple Energy Shroud purchase a minimum of 424 Keys, so it'll be capped by the buyout of 399 Keys that the seller had.

https://imgur.com/a/DkIfHPs - Keys were 73.5 Refined each at the time

You could make a new suggestion for this at 399 flat, and if you'd like, you can also suggest the Seared Sorcerer in the "Bulk sale" link at the top of my comment at 750 Keys.