Sh1t, how did I miss this log? I was looking for one of yours around here, but I guess that was before sh1t hit the fan here which was mid January, kind of before you started the log.
I didn't know your squat before, but you got a pretty strong one for sure. What's your bench at, do you know? Because a 245x6 JM press is pretty ridiculous. I know I can bench 315 fast with bicep tendonitis, but I couldn't do a JM press for that much weight, haha.
Anyways, I wanted to address a few issues and I hope you may find what I say helpful. I hope you're not saying the forearm thing with the rope ab work is bothering you even after you do it ... because I can't really help you there besides pointing out obvious things to do. What I can say is that I do rope ab work as well. The way I do it is I explosively pull the rope down before I begin such that the nubs are on the sides of my chest, nestled basically between my pecs and shoulders. In this configuration my arms are flexed completely, as in my forearms are mushing up against my biceps, and my wrists are kind of turned inwards to hold the nubs against my body. When I bend down like this, it's almost as if the nubs of the rope are digging into my body, and so it's like my body is helping my hands hold the weight. I feel like this explanation may be somewhat poor, so ask away if you don't understand (and I may be able to put up a video, we'll see). Hope that can help the issue.
The other thing is when you do a narrower squat, your knees have to bend and come forward after you sit back to allow the bar to be centered (something you avoid with a wide stance), otherwise you're going to basically be doing a good morning. So that'll require loose calves. I still squat with chucks, since it's easier to have only 1 pair of lifting shoes, so doing stuff like DC calf work really helped my calf flexibility which allowed me to better squat to depth with a narrow stance while keeping my back straight. You should also make sure you have proper hip mobility since this can be a source of problems (Zir Red has posted about this somewhere, definitely in some DerickVon threads).
With that said, I don't know how narrow you're actually talking about, and squatting wider will definitely be better for moving heavier weight than squatting narrower. It's simple physics, you have an increased foundation, better support, and more leverage that way. But if you're sinking like 5 inches between standing straight and setting up for the squat you probably should bring it in, haha.
Anyways, I'll definitely be revisiting this log.