Thanks for the kind words, but its' less mastered but shameless copying from other Eve threads in this forum Especially (but not only!) from @Foxster impressing low mass landers.
Thanks for your input guys!
I tried limiting the gimbal to 10, 20 or 30 %. That didn't help with flipping, the rocket just started tumbling earlier.
I tried adding another two booster with vector engines. This didn't helped either, it started tumbling right at the beginning.
So I think the key is reducing drag. I think I can remove the antenna from the capsule. The relays on the bottom can should be enough for the transfer to Eve surface. The rocket itself will be piloted by Jeb, so no need for commsat connection during ascent. The battery is a different story. I play with USI life support, where you need to supply the kerbals with EC. I'm not quite sure, whether the EC in the capsule will be enough. I will test this.
Getting rid of the decoulpers is excellent advice, thanks! I will also try to remove the nose clip
Concerning the jr docking port with heat shield: I tried replacing with a small nosecone, but then the ship was killed during the reentry. It seems I need two heatshields (front and top), any idea how to attach the heatshield AND the nosecone on the top?
Concerning the fuel flow: Nope, the boosters feed the central core but thanks to fuel flow priority they will do the right thing non the less
I tried getting rid of the duct tapes but in the end it messed up my delta v displays.
So for now: Back to the drawing board!