While testing some shield regeneration I had a second ship with a logic clock activated gun shooting the ship I was testing. I noticed that while the shield regen rate on the GUI said 205+ the weapon shooting me was at 50damage second, cycling once a second. I had to up the regen rate to around 1000+ to actual keep up with the weapon.
It looks like the combat nerf to the shield regen rate isn't being shown on the GUI only your full regen rate..