So this is only stock,
Released the clamps, Rocket holds its static position.
Started the Solid booster, Rocket holds its static position.
fins are downscaled to 70% size (in original size everythings working fine also without TS)
Without mods except TS I also have the described problem.
Still using KSP 1.1.2 X64 and Tweakscale v2.2.9 and play in Career Mode
Maybe its important as well:
The Pre 2.2.9 Version worked fine in 1.1.1
That problem began, when KSP version changed from 1.1.1 to 1.1.2, changed to 2.2.9 to eventually solve that bug.
Greetings