First things to check are mechanical - is the steering system moving freely, is the servo set up so that you are actually reaching full lock?
Some people dislike the built-in servo saver on the B4 and lock it up - can't say I have had a problem with the FT kit spring myself.
Next thing is tyres... try some different ones! On grass and astro it's almost always Schumacher's yellow compound, with minispikes (with varying amounts of spikes trimmed from the outer rows), cut staggers, or stagger ribs as the options.
More weight over the front will give more front end grip. Setting the slipper correctly will stop the front end coming off the ground at the wrong time. You can also try softer front springs or some geometry tweaks.
Driving style matters too. You can't go hot into a corner and scrub off the speed with the steering like you can with a 4wd. You need to get the car slowed down in a straight line, then steer it throught the corner, and get the power on in a straight line too. Needs a lot more finesse than a 4wd to go neatly round the track.
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