If you're getting excellent sound with the 1006 maybe you should try a Goldring D42 stylus, made for the 1042. This is interchangeable with your stylus and features a Gyger S tip. I don't know if there is any difference in the generators in this series of carts, but they all have identical specs and seem to be the same. It looks as if you'd be upgrading your cart to a 1042.
The MK IV is a very low mass arm and even though you have that sliding weight on the arm tube, I think you'd have best results with higher compliance carts. For lower compliance slide the weight toward the headshell to increase effective arm mass. In general, MCs are not recommended.