I switched from the Accuwedge to the Accushim from Diamondwheel.com. I use CMC and JP Enterprises triggers on my hunting ARs. I like the Magpul MOE K2 plus over the standard grips due to the angle, fits me better when shooting prone. I square the receivers on my builds. Ace skeleton stock, foam is nice on the cheek in the cold winter.
I wasn't familiar with the Accuracy-Shim. Looks like a great approach. I ordered a few for three of my AR's. Unfortunately, my custom upper on my 6mmAR, my most accurate AR, doesn't have the standard recess to accommodate the Accu-shim.