I'll look into the Raids rate and see what I can do. It's based on points way more than before so low point players who don't participate much will have a hard time getting anything, while active players with high points will have an easier time getting rewards.
The Karambwan update is tricky since simply making them stackable makes Karambwan way easier to fish, and if we were to add it as a fishing method and remove it from the shop.. well, as you can probably guess many people have already stacked them up in their bank in anticipation of this change. No guarantees yet.
Your bird nest suggestion is slightly lacking, though. Do you mean that they should be more common from Woodcutting, or that there should be more methods to obtain them?
With my personal First-Hand experience with raids, the system seems to have flaws. In most cases players who drop 5k OR MORE points in a raid actually get less item quantities (such as uncuts, herbs, runes) than players in the 3-4k point range. I also had tested the points with point farming raids, and even then we did not see a single drop within the 10+ point farming raids we did. Just low quantities of loots, and it is true, there has only been one drop since the update has taken place and I have been doing 20-40 raids a day >_>