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Ghostrider,
I think it must be taken into consideration the levels of grip in the sim. Like you said, the conditions you drive in require a setup that is a certain way to achieve certain handling. I typically do the same thing as you do when there's lots of grip in the track. But you have to think of it in terms of the inside rear wheel lifting rather than the amount of grip you have. The main thing is that you are trying to get the inside rear to lift so that you can corner. In reality, a soft axle can do this or a hard axle can do this, but it is fully dependent on the track conditions. The track's grip level dictates what axle you use obviously.
For example, sometimes a stiff axle (which generates a stable, quick lift of the inside rear in high grip conditions) can make the kart too free if you are getting too quick of a lift on turn-in. In this instance, a soft axle could slow that lift down and make it so you don't lose traction and have to counter-steer mid-corner. That is an instance where a soft axle would give more "grip".
Sometimes if you are over-flexing the soft axle, it will cause you to have oversteer because you are getting too much lift and flex and not enough side bite because you have less of a "spring-rate" on the outside rear tire (less force on the outside rear because of the softer axle absorbing some weight transfer). If you put a stiff axle in, it'll take away some of that flex and settle the rear down, making it feel like you have more "grip" because you aren't overloading the outside rear tire and you are generating enough sidebite because of the increased "spring-rate" so you take away oversteer.
So in summary, I believe that the sim uses fairly low grip levels, which makes your changes contrary to what you experience in real-life Ghostrider.
I think it must be taken into consideration the levels of grip in the sim. Like you said, the conditions you drive in require a setup that is a certain way to achieve certain handling. I typically do the same thing as you do when there's lots of grip in the track. But you have to think of it in terms of the inside rear wheel lifting rather than the amount of grip you have. The main thing is that you are trying to get the inside rear to lift so that you can corner. In reality, a soft axle can do this or a hard axle can do this, but it is fully dependent on the track conditions. The track's grip level dictates what axle you use obviously.
For example, sometimes a stiff axle (which generates a stable, quick lift of the inside rear in high grip conditions) can make the kart too free if you are getting too quick of a lift on turn-in. In this instance, a soft axle could slow that lift down and make it so you don't lose traction and have to counter-steer mid-corner. That is an instance where a soft axle would give more "grip".
Sometimes if you are over-flexing the soft axle, it will cause you to have oversteer because you are getting too much lift and flex and not enough side bite because you have less of a "spring-rate" on the outside rear tire (less force on the outside rear because of the softer axle absorbing some weight transfer). If you put a stiff axle in, it'll take away some of that flex and settle the rear down, making it feel like you have more "grip" because you aren't overloading the outside rear tire and you are generating enough sidebite because of the increased "spring-rate" so you take away oversteer.
So in summary, I believe that the sim uses fairly low grip levels, which makes your changes contrary to what you experience in real-life Ghostrider.
But without proper carb tuning, choking the engine seems pretty useless since we can't run it extra lean anyway. 
