True, I am not very familiar with Rheinland. But I think it is very reasonable that a transport doesn't stand a chance vs. a cruiser. Also I think it is kinda cool that the Omegas are contested, and that it isn't easy to just go out and mine like crazy, ez-mode. If all miners in the Omegas set aside 10% of your accumulated profits for mercenaries, you would be able to fund an army while still making a fortune in the process. Or set up some sort of deal with the Hessians where you give them a cut.
EDIT: Even after all the troubles with the Hessians and whatnot, there must be a reason why you choose mining over trading? Aren't you still making a fortune?