Traffic Shaper Troubleshooting

[CJ]

I have a server in a DMZ with 443 forwarded to it.  I have a Shaper rule configured to limit it's bandwidth to the internet but allow full speed locally.  Previously the pipe limit was 10Mbps but after upgrading my connection speed I've increased it to 50Mbps.

However, I was initially only seeing 8-10Mbps transfers.  I'm looking at the Shaper status page but it's not exactly clear as to what it's doing and how well it's working.