Not sure if this is a known issue, or something I'm doing wrong.
I'm trying to get my fleet to lead my assault transports to a planet occupied by a spoiler with active STO's. I want my assault carriers and battlecruisers in my fleet to absorb the heavy STO fire as they approach the planet, with the assault transports following 50,000 kilometers behind. Seems easy enough. Order the fleet to move to the planet, and hit the "set speed" button to reduce the fleet's speed to match the slower assault transports speed, so they don't leave the troop transports behind. Then order the assault transports to follow the fleet at 50,000 kilometers separation. Should work, based on my understanding.
However, every single time when I hit the time advance button, my fleet's speed resets to its maximum and it leaves the troop transports behind. Am I doing this wrong?