Update: I recently made an emprovement to the heatbed and i made it this way:
First i cut out a piece of kapton 200x200.
Then i found some iron wire, which i tested with 12v on my psu, to see how much heat it would make and also if it would burn out. It turned out to be perfect.
I then put the end of the wire sticking out by 15mm of the kapton sheet, and soldered a wire to it (surprised to see how easy that was)
After that i made a pattern of straight wire followed by U-turns when reaching the sides of the kapton, until i reached the edge of the sheet.
Thereafter i again made about 15mm stick out and soldered another wire to the new end.
I then cut out a piece of kapton similar to the first one and stuck them together to insulate this newly made heatpad.
Then the old heatpad had to come off and to my big surprise the thermistor was not secured properly, so i fixed that with some thermal adhesive.
I fixed the new heatpad to the underside of the bed without glue, by just poking holes in the sheet for the adjustment screws.
Following i slapped the old heatpad onto the new one and just assembled the heatbed like usual. (so that would effectively double the heat)
I soldered both heatpads up to a 12v relay which would turn on when the pcb turned the bed on. I did this because i did not want to draw that much current thru the pcb itself.

This upgrade gives me above 105C stable

I would take pictures but i cant be bothered to take it all apart again, now that it works so well I hope you understand my description :P