That's the reason I'm sure it's not blight or any other disease otherwise the whole plant would be affected. All of the bines are competing for nutrients, so if the bine with the problem is trying to source its food from a dry area it's not going to get much. The rest of the rhizome maybe able...
Chook pellets are good, they just take longer to break down. You can also make a tea out of the pellets to make a liquid fertiliser. You can make heaps cause it needs to be diluted when applying. Adding the pellets on top though will give the roots frequent access to nutrients.
The bine could be coming off a part of the rhizome that is close to the edge. What did you put in the pot soil wise? As for your yard, it is all in the preparation. Dig deep and mix in gympsum to break up the clay. Lots of animal poo to introduce organic matter (i use buttloads of horse poo...
It looks like a lack of nutes. I doubt your plant is going well in that pot. Is it ceramic? Black absorbs heat and will be frying the crapper out of the sides of your pot. It will be dry a few inches in around the edges and preventing proper uptake of nutes. If you can mate you should just plant...
Install one pf these on the bottom of your pot
http://www.cheekypeakbrewery.com.au/index.php/everything-mashing/brewing-kettle-accessories/product/180-1-2-stainless-steel-2-piece-full-bore-ball-valve?search=valve
I aim for 78c mashout with BIAB. Works a treat. If you want to improve the efficiency another 5-10% you can do a mini sparge with the bag of grain in a fermenter. If you aren't using any acids in your water, then keep the sparge volume down low, because the out of whack ph festers an easier...
I live a 20 minute drive from Keg King, and I can guarantee Cheeky Peek would have it delivered to my door from Wodonga before I even get served. Is Keg King run by the local council? It seems they have a lot of people standing around...