In my experience, an inch or two of lift is ideal for most corners, but it depends on how tight the corner is, what tires, what weight, etc. With the huge lift, for me it has always really thrown the kart to the outside and overloaded the outside tires. Lots of factors to affect it though. Driving style obviously plays a huge role in it as well.
Personally, if the kart is able to take all that lift and not start hopping or sliding, then it doesn’t matter how high off the ground the inside rear is, as long as it’s up.