Well...my best Eve Lander was capable of orbiting from like 2161 Meters ASL and Delta v DIDN'T EVEN REACH 7000 m/s (a little smaller actually yet still has around 100 m/s in orbit) and is like 44 tons, No MechJeb, your designs are nice, you only need to get rid of most of the mass as booster stages so you can have massive TWR and massive delta v, one FL T-800 to fuel core stage is in fact...enough, and you'll need 4 FL T-800, 4 FL T-400 boosters (put the big tanks below the small tanks and use 4 simetry) with at least 2 Aerospikes, orbital stage only need one Terrier fueled with one FL T-400 tank, you can still use landing legs instead of Fairing Base, and try aiming higher grounds, like That Mt.You-Know-What.
That Lander, Sorry if it's too dark.