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I have big problems with heat creep...

I have already conquered a lot of problems, but i'm afraid this will be my end..

I am trying to print the calibration cube in PLA 1.75, but despite different settings, i will stop after approximately 15 seconds.

I have tried following settings:
220 degrees celcius
Speed from 1mm/s to 12mm/s. (Eventhough he said not higher than 1mm/s)
Tried different heights so i wasn't because filament couldn't come out.
2 fans blowing on the part clossest to the hotend

When i do it in air with pronterface 150mm/min it is no problem. But when it starts to print suddenly it is..

In the beginning it will extrude a normal amount and very quickly it becomes less and less that gets extruded out. And then it is just small drops sometimes, getting out.

When i pull it out, while it is still hot, there will be this really thick end coming out. So my guess is that this is heat creep?

What can i do? i am totally lost here.
I'm afraid the low speed is causing this behaviour, can i change it somehow?