Asymmetric fuel transfer and how to avoid it

[king of nowhere]

Finding myself with a bit of a problem here. I am about to split my mothership in two, and I am transferring the fuel to the part that will need it most; routine operation, but I noticed something different

If you can't tell from the image, there are a bunch of fuel tanks with a radial symmetry. I selected all of them simultaneously, then drained the fuel to another target tank

Here I noticed that some of the fuel tanks had a lot more fuel left than some others.

the tanks are all symmetric. they are all identical. I started with my tanks full after completing isru on the planet below, and they were all at the same level after ascent.

yet now that I drained them into the big tank, their individual fuel levels changed. some tanks were drained faster than others.

as you can imagine, this is going to be a problem because my fuel mass will no longer by symmetrical. it may lead to asymmetric thrust and the ship spinning - though as long as the difference is small, the reaction wheels and gimbals can compensate.

I want to stress once more than I never did anything that could differentiate those fuel tanks. I selected them all simultaneously before giving the transfer order - which was for the larger tank to get fuel inside it.

Anyone knows why fuel is behaving like that, and how I can fix the issue without manually readjusting all the tanks?

 

[Caerfinon]

23 minutes ago, king of nowhere said:

how I can fix the issue without manually readjusting all the tanks?

I use a mod called TAC Fuel Balancer. It can control the balanced transfer of fuel around a large ship or between docked ships from a single window.