You can change the telemetry ratio to get more frequent updates. The default ratio (bare minimum) is not enough for my liking. Especially if you are running a flight controller with a bunch of telemetry fields. I usually run 333Hz/full (8 channels full resolution) and a telemetry ratio of 1:8. This does NOT reduce the control updates, just increases how often telemetry is sent back, and therefor increases how much telemetry data can be sent back. There is a prioritization of data types, and if the data rate isn't high enough, low priority telemetry data almost never gets sent back.