Float weirdness and attribute duplication have been fixed with a code transplant from TF2B proper. (Both bugs are result of API weirdness (Thanks Valve))

As for sheen/killstreaker, the answer is likely no as there is probably no API support for listing that data. If you could provide a screenshot of what the tooltip should be and an reference item of TF2B however I can at least take a look.

This is what shows on the tooltip for my Spec. Cow Mangler - http://i.imgur.com/4Z0aDPR.png
and the item page for it - http://tf2b.com/tf2/item/rend-/2216280849

So instead of it listing 'Sheen: 3' it would have 'Sheen: Manndarin'

And from what I can tell, this is what sheen a specific number is:
1 - Team Shine
2 - Deadly Daffodil
3 - Manndarin
4 - Mean Green
5 - Agonizing Emerald
6 - Villainous Violet
7 - Hot Rod

and these should be the killstreakers:
2002 - Fire Horns
2003 - Cerebral Discharge
2004 - Tornado
2005 - Flames
2006 - Singularity
2007 - Incinerator
2008 - Hypno-Beam

I'm pretty sure those are correct.

Yes, definitely +1 for sheen/killstreaker names.

Not a trace of said data in the APIs I'm afraid, so for now it's a no. But I'll see what I can do through other means.

Ah that's unfortunate :(
Still, thanks for fixing the other things so quickly.

I would love to see the sheen and killstreaker names too. I really hope you folks can find a way to implement those features somehow.