Hey djm34, there's something is wrong with the compiled binary that you post https://bitcointalk.org/index.php?topic=404364.msg9817141#msg9817141

When hashing lyra2RE (vtc), the hashrate shown on the miner is indeed faster 5-10% than the metalicjames one, but on pool it will only record half the hashrate.
All stats normal, low rejected shares, no hardware errors that are shown on the miners.
Tested it on two different pools, coinotron and hashlink.eu, still when using your windows binary, only half hashrate will be recorded on the web.
Somehow only half the shares are sent by the miners or accepted by the pool.
And it's not  just estimations only, the coin received is halved for the same time period.
When back on using metalicjames version, the hashrate going back to normal again.

Where's that half hashrate gone??
Could you please recheck the binaries. Thanks.