Not sure if you have tried this yet but do you have any long zip ties? If you loop the zip tie through the a-arm and then up through the shock tower and start tightening it down it will compress the shock. Keep pulling until you get the truck as low as you want. You will have to do it to all four wheels on the truck but this will lower the truck to whatever ride height you want. Then take it for a drive. If this works then you can work on the shocks to get it this low. The zipties will be easy and cheap to see how well it makes a difference having it low.

The problem with those really soft losi spring is ANY bump at all and you are smacking the chassis on the pavement.

Get it as low as possible. Not sure if you figured out the fuel tubing inside of the shock but it works great. You get a nice stiff shock but it doesn't expand all the way.

Here is something I threw together real quick. Sorry its kind of bland.