I totally agree that you are on the right track - looks good.
I don't crimp any of my double loads but I do get tight neck tension.
From the looks of it, you may just want to stay with the bullets you are using/sizing and add the crimp to hold the bullet better or as mentioned measure the plug and see if it is oversize a bit. I have read that crimping alone can effect regulation in a small way and may be just the thing to get velocities more consistent.
Anybody know just what to expect with crimping as opposed to a loose bullet fit?