I also burned away my solder points on my wii dvd drive. After that I brought my wii + wiikey away to an pro (in Eindhoven, Netherlands). He soldered the wiikey directly on the chip. It was 50 euro for the install, but I missed 3 solder points. If you only miss one it would be cheaper.
Good luck
I think your wiikey isn't connected properly or you have a loosy wiikey clone. I can't imagen that a real Wiikey doesn't work properly with all the different things you have tried.
A few things you could try:
1. burn faster
2. try other media
3. check PAL/NTSC compatibility on the wiki
4. try other iso's (maybe you had a bad iso)
5. Change the speed settings of the wiikey with the setup disc
I used the servers of my ISP, but they were very slow. Since a few weeks I have a 20mbit internet connection and now I use a dutch pay newsserver. These pay servers are really great!! Don't go for free ones, just pay a 6-10 $ a month.
Make sure you do not solder at too high temperatures. I did mine at 250-300 degrees celcius and burned of the solder points. I had to solder the wiikey directly onto the chip on the wiidrive!
So be careful with that.
ok, I patched it with RegionFrii and burned it.
I could see the title screen, but when starting it I only got a white screen.
After that I changed the language settings to English and IT WORKS!!