XRAY - Model racing cars

I'm running the XT8 converted to electric and geared for speed, we have a large track and are hitting top speed a lot. My problem is the I cannot keep the front tires on the ground. I'm easy on the throttle and roll on it but as I get near full throttle the truck pops up and wheelies.

Any tips or ides on how to prevent it from wheeling? I would love to be able to actually use full throttle.

Here is my setup sheet:

Going lighter on the center diff fluid will put more drive on the front wheels thus keeping them on the ground. I've never needed to run anywhere near as heavy as 20k in the center diff. I'm typically between 7k and 10k.

Also going to a taller pinion will help as well as dialing down your esc.