I’d recommend some Dboots backflips for tires (4s version). If getting another RC go for an Arrma Notorious 6s, it’s extremely easy to work on, really durable, and has great parts support. Also, Arrma doesn’t shut down small companies like Traxxas does (Arrma got sued by Traxxas for using...
Never had an issue with aluminum links but titanium is the best for sure. High quality LiPos like CNHL have really good performance compared to cheaper brands such as Traxxas, Hoovo, or Zeee.