Thanks @VictorLerp , I did not realise you can open “my blueprint” and dock it there, sorry 
I played around with the Fullbody solver, and when I want to control the hand effectors (bones hand_l and hand_r) the target is not reached fully. see screenshot: https://www.dropbox.com/s/z2086nfubl962nt/Screen2020-11-11%2012%2010%2053.jpg?dl=0 It seems as though the influence by the control on the bone transform is not a 100% or as if there were some constraints / stiffness parameters applied. But I double checked the setup. and there are no constraints specified anywhere. Also the position alpha is set to 1.0 throughout. Finally I tried to lower “damping” and “max iterations” to no avail. Any ideas?
It is only ocurring when I want to use controls. If I, say, directly manipulate the pin value (“control pin value”) on the position of the effectors, it does reach the target a 100%.
Sorry, If I am missing something very obvious.