Well, of course, its difficult to get a proper identification from photograph alone, but forget Aphonopelma,. and look towards the dominant genera in the area. Acanthoscurria is a possibility, and the species vary greatly, but to me this looks much more like another genus called Vitalius. But those are currently only known from southern Brasilian states. Another possibility is Proshapalopus, and another lesser possibility is Nhandu. You would need them properly examined. If it moults i suggest look for a spermathcae and photgraph that.
Anyway, your best option is to contact brasilian researcher, i would suggest Dr Rogerio Bertani, or Dra Sylvia Lucas, its quite possible you found something new there.
How big is it?
Could look a little like a Megaphobema robustum in dire need of a molt.
I just checked and the M. robustum can be found "Tropical rainforests of Columbia, as well as northern and southern Brazil" just like you said it was.
There is one sure way to identify a Megaphobema. Other than the bushy hind legs it has a unique threat pose. Instead of "baring fangs" by standing on its hind legs it'll stretch itself upwards from the ground on all legs to appear taller. If you've seen it do that, then it's likely a Megaphobema.
Hello fellow Davison,I would go with Vitalius genre, I personally saw that one you sent to Sao Paulo, and definitely not an Aphonopelma, the elevation on the base of ocular region of the carapacea, reminds me of the genre Vitalius. It could be an Acanthoscurria too, by the way it´s a very beautifull species, congrats on the new slings!