Hi Dex,
Running 4.5 also and I'm seeing the stripped wakes too - but as near as I can tell only with the Tongass boats;Leconte, Matanuska, Anacapa, and the fishing boats.
Maybe also the Marignan, the one used at Halibut cove.
Looks to me after watching them they are spawing in chunks thus the stripped effect
Hope this helps,
Bob