Considering the fact that youre using sellers, it makes no sense to stretch the range as far as you do (e.g if 55 doesnt sell, why include everything all the way up to 75 in the range?).

Other than that, the miami TC will need a mini and youll need to check the sellers BO. it would also really help if you would post the item histories and/or backpacks before/after the trade, so that its easier to check the sale.

More sales:

Sale 1:

Sold for a pro aussie scatter (~45):

http://backpack.tf/profiles/76561198153186550?time=1436845466 before

http://backpack.tf/profiles/76561198153186550?time=1437030000 after

Sale 2:

Sold + stormy soviet gentleman + 3 keys + bud (7total) for beams stovepipe

http://www.tf2outpost.com/trade/25795122 offered here

Buyer:

http://backpack.tf/profiles/76561198029654784?time=1433656447 before

http://backpack.tf/profiles/76561198029654784?time=1433660400 after

Seller:

http://backpack.tf/profiles/76561198028257806?time=1433691564 before

http://backpack.tf/profiles/76561198028257806?time=1434265200 after

Probably best to update the stove with this, but it certainly supports to drop

Sale 3:

Sold for 45 pure

http://backpack.tf/profiles/76561198001874392?time=1437198483 before

http://backpack.tf/profiles/76561198001874392?time=1437202800 after

Sold in 2 days

All sales i found support the drop, but the range is probably off (on the high side). I suggest you find a proper mini on the miami TC (I can look into that if you'd like) and use that sale as your high end and the lowest well-bumped seller or either of the sales I have at 45 as your low end (although I guess thats up to you, both sold fairly fast).

[EDIT]

As a comment to what Ive read in the comments on the previous suggestion:

Yes, lowering based on buyouts IS still acceptable. If the sellers mature properly, this might even get accepted (although I HIGHLY doubt it due to the high end being set at 75, which is clearly too high). As you've stated, suggestions like these have been accepted before (although the eyelander one is not a good example, aussie suggestions are very different from unusual suggestions), but theyve been accepted based on the fact that the suggested range is closer to the actual one than the current range. Seeing the sales, the new range is still too high and therefore not accurate at all. For this reason, having actual sales is far more accurate than having just sellers.

Do note that when you use sellers, you will have to check if theyre not duped. at least two of your sellers are duped sellers (like culfides one: http://backpack.tf/item/2210614697 )

Sellers can be used to lower a price.