Well these are circumstances/situations that are not covered in most iterations of Traveller.
A much more frugal use of TK, use a little clairvoyance and see inside his head, TK pinch off a major artery like the Carotid.
As for the brute force examples you listed...
In my game to TK a head off, PSI Str of at least 12 preferably, and would use all available psi points. Range would have to be short or less too.
I have toyed with TK a projectile to lethal velocities, was going to self terminate my character due being captured by the Imperials, character was a Zhodani. Again it was figured to use all available psi points, that pc had a psi str of 15 with out drugs, again range would have been short.
You could lift your TK str level quite easily, holding it up for more than a brief second, would be the pain, do not forgot to take into account the range costs also.
As velocity....a 1kg brick moving at 100 meters per second will hurt, or a .1kg ball moving at 1000 meters per second will also hurt what it hits.
I think the closest I have seen anything like you have posted here, happen in any of my Traveller games was a pc who enhanced his str to the max it could get to, something he had never done before, then whipped out his Webley type heavy revolver and rapidly placed the barrel to the fore head of one he wanted to question/interrogate. I had him roll 2 d 6 to see how well he was controlling his new str, he rolled a 2!!!. Shoved the barrel of the revolver deep into the head of the prisoner. Net result he did not get to question/interrogate that prisoner. Did wonderful things for enhancing his questioning the other prisoners in the room when it happened.
Same pc in a later adventure tried the same trick but this time was going to use his index finger to point into the fore head of another prisoner. Not intending to do anything but place it there. Net results same as before, shoved index finger into the forehead of the prisoner. Manage not to severely damage his index finger. But again enhanced his questioning of the other prisoners in the room.
He never caught on to "practice" his tricks moves with enhanced str.
A system with such moves laid out, I would recommend Green Ronin's Psychic's Handbook.