Default [Q] Major Issues!!!

I have done all the things in this thread here: http://forum.xda-developers.com/show....php?t=2632730

Everything "seemed" fine until I tried using WiFi, I actually have to hit the wifi button and then restart my phone for the wifi to actually work, weird...

Besides that, the phone has just been restarting itself and it's happening more and more. And lately, it's wicked slow with just about everything I try to do... its just super glitchy. So I thought that maybe starting from scratch would be the best way to make things right, and then re-root...

But doing this caused many questions while reading through the forum and I'm hoping that someone can help point me in the right direction...

I guess the most important questions are:
Do I wipe the phone and do a clean install, going back to stock first?
If so, because I have followed the instructions in the link above, what are the exact steps so that I don't brick it?
Should I just buy a new phone?
If I did a clean install and then re-root will it run better than it is now?

I have many more questions but I think answering these first will help out a lot...

Thanks to whoever can help me out...

Android Version 4.3
Baseband Version I605VRUEMJ9
Kernel Version 3.0.31
Build Number JSS15J.I605VRUEMJ9

Edit: I installed the new Dodol Launcher and miraculously my WiFi is working again! So I uninstalled the Nova Launcher... I am happy that I can toggle my wifi settings once again =) But I read something extremely upsetting about 2mins ago in regards to the people with unlimited data which I have, and that is, we cannot use third party apps to tether the hotspot if we did the 4.3 update!!!??? Does anyone know if this is true? I thought that I couldn't tether because my phone is somehow screwed up, not because they blocked me from using it...