1) Is the rifle a bolt action or semi-auto? For a bolt application, you will want a neck tension around 0.002 ± 0.0005. For semi-auto, about 0.001 more. Measure a loaded round neck OD in the brass in question (different brass manufacturers have different neck thicknesses). This is your reference point. Then shoot for a sized neck OD 0.002" less to achieve a neck tension of 0.002". Adjust your neck bushing according to get the desired end result. Be sure to adequately lube your cases/necks when sizing. And if you plan to anneal, anneal EVERY loading cycle (at least once) for consistency (I anneal before sizing). Some folks (AKSR) anneal 2x per loading cycle!!! If you are using neck sizing bushings to adjust your neck tension, you don't need an expander so you should remove it from your sizing die.
2) I don't understand a 0.090 bushing. My bushings for my neck sizing dies are the size of the OD of the case neck.