I would imagine if they say 50/25/25. That will be the wood with no fillers..well maybe bark filler? I've cooked a while with pellets and have found that the moisture content of the wood is a BIG item. That is something that only cooking with them will reveal, which leaves more ash that is grainy.
While MossyMO may not like the 30/70 oak blend pellets, that's all i cook with. I may mix the cherry blended with the hickory blended to get a little "color'. You are close enough to Candy Sue that maybe you can go with another cook to buy bulk from BBQers Delight? Her pellets are some of the best that I've used, just my experience though!