oic , yes the CG is really high thats why when u climb up a big degree lean slope it will drop easily. Install some lead at the wheel can improved a little bit but still worser than AX10
u can find a lead pad easily at KWS. Around $10/pad
Change metal 2.2 wheel and tires with lead pad will improved on climbing.
If u play sand road , just basic off road, original will be fine.