Is that "custom crazyintro" thing a theme, or something else? We discourage the use of themes unless you are doing it on a recoverable boot2 system or doing it on an emulated NAND (so you don't blow up your actual NAND when things fail -- note I didn't say if. Things usually do go south when it comes to working with themes).
The fact that you have priiloader still working is the only reason why you don't have a paper weight right now.
I would go through the Softmod Any Wii guide (link in my signature) to remod the system from scratch. Since you have to dangle everything through priiloader on each boot until you finish things, it will slow things down a little, but everything should still work.
Start in chapter 1 where it says for systems with HBC already installed, but instead of running your apps through homebrew, you'll have to run them through priiloader to launch the apps to do the wad installs.
I'm going to ask mauifrog to chime in on this to make sure that everything that I said was right, so don't do anything yet until he speaks up. But this should be fixable.