Aggie, you have halation. Even the best anti-halation coatings aren't perfect, just like the anti-reflex coatings on lenses. This is a fact of life, and no developer is going to get rid of it.

Sandy, halation and infectous development are completely unrelated phenomena. One is optical, the other is chemical. Infectious development is normally only seen with the (extreme) high-contrast developers known as lith developers. If other developers show infectious development, they shouldn't be used.

For a nice example of halation, look at the woodland negatives in Les McLean's book...