It sounds like you may have everything too tight.
Firstly loosen the diff untill its reasonably smooth when you rotate the wheels.
The way I set the slipper is to take the gear cover off and then when sitting down hold the right rear wheel between your legs so it cant move.
Then hold the spur gear using your left hand and turn the left rear wheel with your right hand.
You need to set the slipper so that the layshaft turns around and the slipper slips.
If the wheel turns and the layshaft stays still then the diff is slipping and you need to loosen it off a bit more (the slipper)
Doing it this way also gives you a feel for how tight things really are, if its very easy to slip the diff then tighten it up a bit. If its very hard to make the slipper slip (even if the diff is holding) then you will need to loosen the slipper to prevent the car doing wheelies.. you may also want to losen the diff to make its action smoother.
If you have raced the car with the diff slipping you may need to replace the diff balls and plates as they might have worn out.. Im not a madrat expert but another member should be able to recomend parts to use (it might be better to upgrade these parts than use madrat ones)
There are also upgrades that can be done to the madrat slipper to make it easyer to adjust.
With a 6.5 motor you will want to slipper to be reasonably loose to keep the power on the track. Many "beginners" set there slippers too tight and then damage diffs.
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