Analyze a standard Raft consensus implementation operating in a geo-distributed network with high latency and frequent partitions. Propose theoretical modifications to the leader election and log replication mechanisms to optimize for write availability and reduce 'churn' during unstable network conditions. Specifically address: 1) The trade-offs of using 'pre-vote' to prevent disconnected nodes from disrupting the cluster. 2) Strategies for handling quorum reads without requiring leader lease confirmation on every read. 3) A method for prioritizing leader candidates based on data freshness or up-to-date logs. Provide a state-machine diagram description of the modified leader election cycle.