firstly, don't listen to a single word Stampede has said, he is simply a basher and can't built a car right to save his life.
The kit spring on the madrat is fairly strong so even when backed off completely it still puts a lot of pressure on the slipper. One trick is to lock the slipper up fully and leave it for a few days when you aren't using the car. When you take the car back out, back the slipper off and you will find that the spring has compressed slightly, giving you more adjustment range.
No need to change the slipper, the madrat one will work ok if set correctly.
As for weight, my Rat weighed in at around 1700g with a lipo. I have arounf 200g at the front end, under steering rack, on servo etc. I also have a bit more weight in the chassis side pods, and the steel t plate adds extra weight too.
If you are running at 1500g with a lipo and brushless then you will probably wheelie on high grip.
What motor/gearing are you running? you may be able to go up a tooth or two to take away some punch. Also reduce your speedo punch setting to a lower one if it has one?
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