Wire length - too long or doesn't matter?

[10kman]

Just got my new E-Revo completed. I was waiting on parts and selling some others to fund the project, and finally got it outside today (even in the 20 degree cold). Nice truck, very fast setup. Neu 1515 1/y F, Quark 125, Spektrum DSM2 radio gear, single steering servo, etc. Nothing special or out of the ordinary, just a solid setup.

My only thing I'm wondering about is the wire length. The leads coming off of the packs are longer than I would have personally done, and I also have to use a series harness to get them to 4s.

Should I shorten up the battery pack leads? Does it actually make a difference? It's all 12g wire and Dean's. I feel no heat in the wires after use, this is more of a "does it matter" question.

Thanks all,

10k