Looking to raise my backpack value, help a brotha out

http://www.tf2outpost.com/trade/16344420 Buyout of 5 buds

C/O of 4.5 pure, but I don't see any proof of it

http://www.tf2outpost.com/trade/16192808 Sold for Vivid Plasma Hustler's Hallmark ("Private chat") (3.7 buds)

http://www.tf2outpost.com/item/440,2132774094 Trophy

http://www.tf2outpost.com/item/440,2149959111 Hallmark

http://www.tf2outpost.com/trade/16065116 Seems to have sold for Max + 15 keys (10th comment from the top) (3.1 buds)

http://www.tf2outpost.com/item/440,2132774238 Max

http://www.tf2outpost.com/item/440,2116832361 Trophy

http://www.tf2outpost.com/trade/15913116 Sold for Purple Energy Yellow Belt + ~10 keys (Last two comments at bottom) (4.4 buds)

http://www.tf2outpost.com/item/440,1956305430 Trophy

http://www.tf2outpost.com/item/440,2184871546 Belt

http://www.tf2outpost.com/trade/14500232 Sold for Vivid Festive Tree, 27 keys, dirty high five (3.9 buds, but Vivid tree is outdated)

http://www.tf2outpost.com/trade/16340871 Belt added stuff to Poisoned Shadows Private Eye (Unpriced)

-- Offer of 60 keys (3.5 buds)

http://www.tf2outpost.com/trade/15415416 Sold for Purple Energy Liquidator's Lid, S. Festive Huntsman, unknown sweets / keys (3.6 buds)

http://www.tf2outpost.com/item/440,2041217505 Belt

http://www.tf2outpost.com/item/440,2091476210 Liquidator's Lid

http://www.tf2outpost.com/item/440,2093879228 SF Huntsman

Claims to have rejected 3.7 in pure and 4.3 in unusuals

http://www.tf2outpost.com/trade/14632070 Only wanted 3. y u do dis

http://www.tf2outpost.com/trade/16398019

http://backpack.tf/id/76561198064110473?time=1387353600

http://backpack.tf/id/76561198064110473?time=1387612800

Looks like sold for Clean Max and 29 keys? (3.9 buds)

http://www.tf2outpost.com/trade/16445237 I bought mine for 70 keys pure (Comment at the bottom) http://puu.sh/5ZEMu.png (4.1 buds)

Overpay taken as low end, original suggested values used.

Didn't know what to make the range. There seems to be more sales above ~3.5 than under ~3.5, so I considered the 3 bud buyout and 3.1 sale outliers.

Since I suck at unusual suggestions, help me out yo. Thanks.