Resuggestion, thanks to polar for the info!

Deja Vu.

Sale 1:

https://backpack.tf/profiles/76561198047263033#!/compare/1545782400/1545868800

https://backpack.tf/profiles/76561198052582902#!/compare/1545782400/1545868800

Can trace a warpaint?

Sale 2:

https://backpack.tf/profiles/76561198052582902#!/compare/1545782400/1545868800

https://backpack.tf/profiles/76561198337734785#!/compare/1545782400/1545868800

QS

Sale 3:

https://backpack.tf/profiles/76561198337734785#!/compare/1546041600/1546128000

https://backpack.tf/profiles/76561198084126218#!/compare/1546041600/1546128000

Sold for 90 keys

Sale 4:

https://backpack.tf/profiles/76561198084126218#!/compare/1551484800/1551571200

https://backpack.tf/profiles/76561198066582436#!/compare/1551139200/1551571200

Sold for Puzzle Pullover(81) + 40 keys

Total is 121 keys

https://bot.tf/stats/listings/MV8J2P3M

B/O of 115 keys, capping

Sale 5:

https://backpack.tf/profiles/76561198066582436#!/compare/1551830400/1552003200

https://backpack.tf/profiles/76561198232041512#!/compare/1551916800/1552003200

Sold with Aussie Knife(18) + ~15 keys in sweets for Demonflame HoC(142.5)

Total is 109.5 keys

Sale 6:

https://backpack.tf/profiles/76561198232041512#!/compare/1552348800/1552435200

https://backpack.tf/profiles/76561198267226056#!/compare/1552089600/1552435200

Sold for Scorching Falkirk

Falkirk Mini:

https://backpack.tf/suggestion/5c8608406780722bb728e7c9

Suggestion for 157.5 keys

https://bot.tf/stats/listings/Y9K2P36Y

B/O of 135 keys, capping

Sale 7:

https://backpack.tf/profiles/76561198369075257#!/compare/1544918400/1545350400

https://backpack.tf/profiles/76561198112516663#!/compare/1545264000/1545350400

Sold for Gateway Motif(72.5) + Miami Toy Soldier

Nothing on the Soldier

Sale 8:

https://backpack.tf/profiles/76561198072140772#!/compare/1545436800/1545868800

https://backpack.tf/profiles/76561198112516663#!/compare/1545782400/1545868800

Sold for Harvest Billy + D@D Mullet(34) + ~6 keys in sweets

Use there

Sale 9:

https://backpack.tf/profiles/76561198072140772#!/compare/1547683200/1547856000

https://backpack.tf/profiles/76561198056866244#!/compare/1547164800/1547856000

Bulk

Sale 10:

https://backpack.tf/profiles/76561198056866244#!/compare/1550188800/1550361600

https://backpack.tf/profiles/76561198103050565#!/compare/1550102400/1550534400

Untrace

Sale 11:

https://marketplace.tf/items/459;5;u77

$188.00 / $1.65 = 113.94 keys

Barely outdated.

Total sales @:

90, 109.5, 113.94, 115, 135 keys

Buyers up to 83 keys,

Sellers at 150 keys,

polar's Part:

I think you have one outlier on either end here. Maybe 110-115 would be better. Remember your high end sale was actually 150 which you are capping off a b/o. Also probably an outlier.