After a horrific 15 hour period of pulling my hair out, I finally got my phone out of a hardbrick apparently initiated by installing Sweet Child O Mine v3.5. Here's how I got there:
1. When flashing SCOM v3 (following OP precisely), the phone randomly rebooted (around 90% of Aroma installation).
2. When attempting to flash again, Aroma Installer gave a warning saying it did not recognize my phone as a SGS4G. I clicked the checkbox and installed anyway. ROM worked.
3. When trying to upgrade to SCOM v3.5 late last night, I wiped all data and flashed. Got the same warning as before. This time, didn't install.
4. Tried using Gremlin 1-Click before attempting again... Kept getting stuck on factoryfs.rfs. Had to pull the battery multiple times to try to get it to work, but eventually it caught.
5. Tried flashing SCOM v3.5 again... crapped out before Aroma Installer could finish. I started again, got the unrecognized device warning again.
6. Went back to Gremlin 1-Click again... this time, could not get it to catch! Phone was stuck in softbrick.
7. After multiple attempts, decided to try Heimdall 1-Click, to no avail. Checked off "flash bootloaders" and after 3rd attempt, phone went hardbrick (screen wouldn't turn on no matter what I did).
Stayed up until 5 am trying to fix it, but put it aside to work on it again today. Here's how I finally fixed it:
1. Found RaverX3X's 1-Click somewhere on the forums... removed CWM and put me back on Samsung Utils
2. Downloaded all the files from FB's GB Ext4 starter pack page.
3. Managed to get the phone to yellow triangle by: Pulling and replacing battery->Holding Vol + and Vol - ->Inserting USB
4. Ran Odin as Admin, but had to use a different cable and port to get computer to see the phone
5. Finally back on stock KJ6.
Hopefully all that info above will help someone in trouble like I was.
Now I have a new problem: I want to flash SCOM v3.5 again, but I'm afraid of getting soft/hard-bricked again!
To be honest, I dislike the color scheme and the mismatched icon set in SCOM, but it has two things going for it:
1. Smooth as butter (surprisingly, smoother than RaverX3X's VB final for me)
2. Battery life when NOT using phone is amazing (left the phone for a few hours yesterday, didn't move a single percent). The battery drains fairly quickly when phone is in use, however.
So, how do I instally SCOM v3.5 without falling into the same problems? Or, alternately, what other ROM is comparable in terms of smoothness and idle battery life?