I added alittle weight to the front axle to help with climbing. It helped out alot and also helped sidehilling stuff. I ended up using six 1/4oz stick on wheel weights inside the front axle.
This is where is stuck them on the inside of bottom cover.
You will need to file these down alittle on the top cover.

This is where is stuck them on the inside of bottom cover.

You will need to file these down alittle on the top cover.
