After retrying several times this mission, I finally found out why I had so much trouble maintaining Rheza Station alive. It appears that when the first Deimos corvette warps out, all the already launched Jackhammer missiles from Omega wing will try to follow the corvette into subspace, but as she disappears their trajectory leads to the Station instead. As they are friendly missiles, they can't seem to be intercepted, and this friendly fire costs about 20-30 hull integrity to the station.
Do you have any idea how to avoid this 'treason' from Omega wing?