RE: Hi-current connector choice
If the 350 is a "larger" motor you don't need the Deans Ultras or Andersons (those are for 30A+ applications) - by larger I thought you might have meant Hacker C-50 Acros at 60A! For your purposes Deans Micros would be good for 10A or so. Personally I have gone to MP Jet Gold Connectors for convenience, neatness and small size rather than their amp carrying capacity - even the tiny 1.8mm are good for 25A and the 3.5mm are good to >80A - I'll NEVER get to that stage!
Cheers, Phil