I mean that all the 4 outside boosters (not the SRBs) are draining at the same rate.
The fuel ducts are in the right setup, fuel flow priorities are at the default. (could you maybe elaborate on this?) and i did not change the crossfeed settings.
yes, the 4 boosters are decoupled the way that they are set up with the fuel ducts. (in sets of 2, first 2, then the next 2, leaving the central booster to circulize)
the decouplers are doing what they are supposed to do, the way that the rocket is built is that the asparagus setup is not connected radially, but vertically to the transfer stage. They don't matter.
I set it up that the SRBs will be drained, and the main rocket is still running. They are there to just give the rocket a little boost when taking off. (usually, when the SRBs are separated, the main rocket asparagus setup is half full.)
Thanks for the quick reply, and hope that this clarifies some details.