[Wobbly rockets - Now 1.09 - 2 metre parts, verniers, payload fairings, MUCH more]

if its the same problems with the decouplers(specifically the ones designed to hide the engines) i'm having is that they can't support crap for weight. they buckle in on themselves since the top half of the decoupler is fake theres no physical mass to hold it and what its connected to in place. so if you put a semi heavy stage above them the whole thing collapses in on its self.

if need be i can do some screen shots to show what happens.

The 4x fuel burner engine also can't support much weight

Btw, can you fix it so you can only attach something one way on the decoupler? Now if you put it 1cm too high it'll explode

[Wobbly rockets - Now 1.09 - 2 metre parts, verniers, payload fairings, MUCH more]

Smaller engines are more efficient but have lower thrust. They're a better choice if your rocket is light enough to lift, but efficiency won't do you any good if your rocket can't get off the pad. Heavier rockets will need the more powerful, less efficient engines.

I suspect the reason high thrust rockets are not really a very good choice is the extreme thickness of the Kerbal atmosphere at low altitude. Even extremely high levels of thrust won't get you moving very much faster than a much less powerful rocket, most of the energy is just bled off by drag. The aerodynamics of KSP are quite strange indeed, just witness the wall you run into if your orbit dips below 35km.

You might be right, but if the simplest rockets it the most efficient, you might as well not build larger ones

[Wobbly rockets - Now 1.09 - 2 metre parts, verniers, payload fairings, MUCH more]

True, however the medium fuel engine is WAY more powerful than the normal once. Also the new big fuel engine is way less powerful than the normal one. With powerful I mean it reaches way higher speeds/altitude with the powering the same rocket

[Wobbly rockets - Now 1.09 - 2 metre parts, verniers, payload fairings, MUCH more]

These new parts are over powered :-X.

I just snapped 4 medium sized fuel rockets and 4 long tanks (1.08) to my commandpod/SAS and it allowed me to reach escape velocity EASILY (4500m/s) straight up.

This 11 part rocket goes faster and further than my 10-stage rocket from the default KSP :