Without quite knowing what the gouge looks like, my suggestion is to file it out along with some of the surrounding metal, making a even transition along the edge. Then peen it. Depending on how deep it is -- how much you have to file out -- it should probably have several passes under a hammer to thin out the edge. (Do you use a 'peening jig', or hammer and anvil?)
I'm cringing at the photo of your scythe… I would seriously throw a fit if anyone tried to make me cut grass with that (no offence meant!), however, I'm really spoiled when it comes to using finely-tuned well-fitted 'Austrian-style' scythes.
For one thing, your blade is hafted way too far out, (here's some info on that:
http://www.scytheconnection.com/adp/snathmaking/snath2.html#haft)
which makes it pull "like a bobcat by the tail" as the locals here would put it -- basically it's much harder to use than any scythe ever should be… It's likely that that particular blade CAN'T fit properly on that snath due to the angle of the blade's tang… another reason that snath would make great firewood!
And by the way, ScytheWorks (Alexander Vido) usually forwards technical inquires to ScytheConnection (Peter Vido and family), but questions can be sent to either!