I haven't done the crock pot method, so I can't comment on that. I've only done three methods so far, all with 100% VG. First one is the "Tobacco Essence" thread that is around here, which includes heating some VG on a pan (low heat), and stirring in your pipe tobacco. The second method I used was the 'microwave for 10 seconds and filter' method, which wasn't nearly as flavorful as the pan method. I have some tobacco slow-steeping in a jar of VG at room temperature right now, which is the third method. I haven't had a hairy or burnt taste yet. My guess is that either the PG is the problem, or you're mixing too much into your recipes.
Try making a batch for each separate extraction you've done at 5% each, and add 1 drop of apple cider vinegar per 5mls per batch. ACV helps smooth out tobacco juices, you could also just use white vinegar. Start very low, add a touch of vinegar, let it steep for a week, and see if the issue is still there.