Proline B4 rims and Losi rear rims are the same offset.
The reason that it's hard to get steering out of a buggy is that they have a very rearward weight bias to make sure that they have rear traction. Any time you take traction awa from the rear of the car to get steering it becomes harder to get the car out of the corners. When you are squeezing that last 5% out of it it gets very tricky. Also, alot of the rules of road cars do not apply. Having 2" of suspension travel makes things different too. What we are talikng about with the Bk2 not steering enough is that when you get the setup to 90% of optimum every change you make to get it to 100% takes something away somewhere else.
The car is fast for those who can drive it and the B4 is not without it's problems too.
The Bk2 is not a disadvantage. It just isn't quite as versatile as we would like.