[Q] Troublehooting with bricked Galaxy Note needed

Ok ,
I tried to extend the lifetime of my Galaxy Note through replacing the official (sloooow) rom with a custom one. I read so many how-to's online that I got confused. Here is what I did:

First I rooted my phone.

Then I installed CWM via RomManager, which did not work. Altough Rommanager shows an installed CWM the phone always start into Stock Recovery.

I learned that the N7000, in order to use CWM needs a flashed kernel.

I flashed the kernel via Heimdall (Mac OS) with this philz_touch_6.48.4-n7000.tar.md5.

The flashing went successfull (according to Heimdall), and the phone rebooted automatically, but all I see since then is the Samsung Logo (Samsung Galaxy Note GT-N7000) and a yellow triangle. From there is goes nowhere. I can enter Download Mode, but is does not boot. Also no Recovery Mode. Weird.

Any advice where to take it from here? Do I have to flash back the original kernel?