RCS nozzles and multidirection RCS scales terribly for its mass. A 100% size RCS nozzle gives 2 kN of force with a mass of 11 kg. But A 400% size RCS nozzle is 641 kg with a thrust of only 8 kN.
That's 58 times more mass for only 4 times more thrust. This is preposterous. 58/4 = 14 (preposterous!)
It's even worse with a 25% RCS nozzle. A 25% size RCS weighs 1.16 kg, but gives 0.5 kN of thrust. That means it's the 400% is 552 times heavier than the 25% one, but only gives out 16 times the thrust. 552/16 = 34.5 (crazy!)
Please make the RCS nozzles scale properly.