Some Assistance(tips Maybe?) Regarding Tk, an unpleasent situation Options

I am a bit frustrated over TK(arent we all to some extent? xD) but not because of lack of success but because of lack of success born from intent. I will describe a few situations that happaned to me during the times i practiced TK. The main issue is that it happans randomaly and im a person that likes consistancy. The last time made me even more upset since it got me into a situation where i cut my hand pretty deeply and it was very unpleasent(shattared glass door). Anyway... let me eleborate.

Most of the time when i would practice TK i would get either a slight movement\shaking of the object(if it is round) or a very small movement. All this of course while i am focusing on the exercise. Then comes the problamatic(i guess its a problem, not sure really) situations which frustrate me. A few months after ive been practicing(over the years i practice it from time to time), each time, if i am faced with a situation which is emotionaly extreme(very upset for instance) something telekineticaly extreme would occure as a result. Such as me wanting to reach for a hand bag and throw it at a very annoying friend that wouldnt shut up, and as i am reaching for the bag in anger the bag seems to just fly by itself in the direction of her head. Before i am able to reach it phisicaly with my hands. A more recent situation(since ive started once more a couple of weeks ago to practice TK) would be me wanting to close a glass door that wouldnt close. I pushed it once but it wouldnt close all the way and opened again. The second time as i was getting frustrated with it and reached for the door, before i was able to touch it the glass exploded(!) and cut my hand pretty badly as it was flying in all directions.

Now this is all great and stuff of tv shows and movies which we all want and work for... problem is that you can see the diffrence between the results when i try to do it willingly and when it happans randomaly(usualy if i am very upset). Does anyone have any tips to make the "extreme" results the usual? And maybe prevent them from happaning randomaly, as you can tell the last event wasnt very pleasent and now i have to go and get stitches for an opened cut(one of 5 all along my hand, which was far deeper then the others).
I do want to keep practicing and to improve TK but situations like the ones i presented make me feel "whats the point?" you know. Cause if i am allready capable of it to such a degree and practice doesnt lead anywhere close to it.. maybe there is something else i should be doing. :S (simply since TK is an old and sore subject... )

-All random events happaned when i was surrounded by other people or when i was in a social situation\interaction.

-This could be me being sloppy, per say, but to be honest no matter what degree of understanding and control we all think we have... we cannot be perfect all the time hehe.

(I have been to psipog and read manny topics regarding TK, though it would be lovely if anyone is maybe in the same situation i am)

Help would be apreciated,
Shimi.

what level your power is

(IMG:http://knowyourmeme.com/i/362/original/DBZ_PowerLevel_NineThousand.jpg)

Scientific Process: Weed out as many variables as possible until TK is the most (note: Most. Nothing is absolute during initial experiments) plausible explanation. Keep the thermostat stable. Turn off the fans. Dim the lights. Keep the humidity stable. Wear a breathmask to keep breath from changing. Use one of those bubbly capsules carpenters use to make sure the place you set your psiwheel is flat and level with the ground.... etc etc etc.