Many soil problems attributed to soil texture are really problems of structure. You may have been surprise when you tried the texture test. I have a sandy soil with a compacted layer about a foot into the subsoil. I have to use a digging bar to break it up. Any soil type can be compacted, and adding different soil types will not, by itself, cure the structural problem.
Compacted soil is generally structureless or plate soils, pressed into a solid lump.
Heavy, clayey soils with good aggregate structure will still crumble easily. Light, sandy soils will break into clumps. Clay soil with poor structure will resist crumbling, and light, sandy soils will become powdery. The sticky gums that hold the particles together in clumps come from soil organisms, especially earthworms, from excretions and decomposition, and the best way to encourage soil organisms is to add organic matter. At this point, you should recognize that a variety of particle sizes, clumped into aggregates, will provide adequate drainage, while still retaining water and nutrients for the plant.