Gossip should record hash of pull responses which are timed out and fail to insert: https://github.com/solana-labs/solana/blob/ed51cde37/core/src/crds_gossip_pull.rs#L397-L400 so that they are excluded from the next pull request: https://github.com/solana-labs/solana/blob/ed51cde37/core/src/crds_gossip_pull.rs#L486-L491 otherwise the next pull request will likely include the same timed out values and waste bandwidth.