Indeed, those look good, packing a punch for aircrafts to take off from short runways and maybe from aircraft carriers? Btw, how the engine power can be altered in .cfg file? I tried to change thrust and isp but it didn't do anything.
Try building smaller rocket to lift the lander/plane, it really doesn\'t need to be that huge. With smaller rocket you need less fuel-> size becomes smaller.
I found that it is easier to build a long and thick rocket to carry it, like with the new huge fuel tanks. Then it is more stable and start turning after you get out of the thicker atmospere. And remember much rcs-fuel and nozzles!
Does the enterprise engine detach from the space shuttle for you other people when you put throttle over 10%? Even wirh massive struts it detaches or blows up. Hard to reach lightspeed when I can only use 10% throttle