Basically I just use a macro on 4 different browsers and I would say 70-80% of the time I'm able to get my transactions in. Nothing special really .
Thanks for the advice, I have successfully included my transaction in the ViaBTC queue now...
The reason I was suffering with it for days... guess what... my system time was in a delay of 30 seconds... so when I usually pushed the button for submitting the tx, the queue was already filled and that was the reason why I had no success for days now. I don't know why, but I have just checked the UCT somewhere and that time I have realized that my system clock was the problem.... I have syncronized it and voila... The next try was a success (I mean just including, I have no confirmation yet, but I hope in the morning it will have some already...)
Thanks for the advice, anyway, you've helped me a lot!