The file I emailed you contained boot2v2, you probably have a higher boot2 installed in your wii and then it won't work. I will send you the same blocks with boot2v4 installed. Try that one. That should work, if not then you should try a component cable.
Happened to me before, kept flashing all kinds of bootmii nands and it turned out that composite out was broken.
I will also try adding capacitors to data lines and ground will post back results