Hey, yes devs do read forums, and I will make sure to share your feedback, so thank you for taking the time.
Current system looks for shortest path to a core world, because otherwise it would waste resource due to decay. And while enabling manual colony assignment sounds like an option for those who want it, it could create a lot of pressure on some players to min max it, even though it's optional.
The request is worth looking at, and I would like to gather more feedback from you. So assuming there are like 20 colonies feeding into your capital, and the 44 tile planet would steal 10. How many planets would you have manually assigned to the 2 core planets in question?