Need help with my G3-build

[JoFreak]

Stupid unnecessarily fat battery cables!
Hate them!
Why?
They're 8AWG, too fat for my traxxas high current connectors, and takes ages to get the solder liquid on them even with a 100W soldering iron.

10AWG would fit into the traxxas connectors without any problems, doesn't take as long to get soldered.

The difference?
With 6S the difference in wasted power with a current of 100A would be ~13W...

That's just not worth it, now I can see where I can get 10AWG cables, where I can get shrink wrap that fits and the right solder for that kind of soldering job.
Really am pi**ed off by this, all of a sudden those batteries aren't THAT cheap anymore.

Anyone got a source for all the needed parts? Especially cable and shrinkwrap? And a hint on what kind of solder to use?
As well: somebody got advice on how to change the battery cables? Never done that before...