I may change the wires for decent gauge wires before changing chargers..

Hobbywing stuff is excellent. They are the guys who make Speed passion Esc's.

Chargers are also much of a muchness. 99% run the same software.

I cant really comment on the lipos, I have 3 Yeah racing packs. They are fine with my 5.5t Speed passion in my 501x (3600 20c), and in my touring car (3300, 20c). But I haven't had any other packs to compare them to.