Are you also doing UDP encapsulation and any additional NAT's? I'm using transport mode on strongswan. I get about 3% overhead with strongswan and about 5% with tinc, but the throughput on tinc caps out much sooner for me than with strongswan when dealing with high RTT. It could be the tun driver in CentOS causing my issues, possibly.
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Overhead over what, and at which line speed? 1 Gbit/s, 10 Gbit/s?
Tinc on bare metal hardware has pretty low CPU usage at 1 Gbit/s, but not so at 10 Gbit/s.