My Stretched Revo 5T conversion, advice pls

[Overdriven]

During the planning stages I was actually thinking of running both my 5s packs in parallel for the runtime. But when I read more about how evenly they should be charged before connecting them together I decided against it. Would've been more hassle than its worth with my 610i. I might test mounting a pack on the side with some weight added to see what happens, I just don't like ADDING weight.