We DynamoDB to store user alerts and it works fairly well for our use case. However we still run into issues with consumed throughput being well under provision

We DynamoDB to store user alerts and it works fairly well for our use case. However we still run into issues with consumed throughput being well under provisioned but still getting throughput exceptions. We don't use the auto incremented user ID's either. We create a hash of the user ID and some of the other data contained in the alert and it would appear we still have hot partitions.