I too see uneven development.

A couple of suggestions:

1) try pre-soaking the film in water for two minutes prior to development. Make sure that the water is the same temperature as your mixed developer; and
2) start your development with 30 seconds of continuous, gentle, rotating, randomized agitation. After that, you can transition to two gentle, rotating, randomized agitation cycles in 5 seconds each 30 seconds.

Adjust your times if the contrast isn't to taste.