I have been able to put on 7 really good pounds using the Asteroid stack and I have heard of people putting on more but yah there is no guarantee you will be one of these people. My diet and training is very precise to my own needs as I have been doing this for a long time. One thing though after all this time on more of a plateau I could not be. So that 7 lbs is very good for my situation.
The key to building naturally is patience, your going to gain 10 lbs just may not be in the next couple months. It on the other hand may be, I don't know how well you're set up. Stick with it and over the long haul you could be bigger than some who use PS. Modern herbal supplentation is quite good, I will be competing around 20 lbs heavier than I ever have and I'm an old fugger. Stay the course. Run a couple 8 week back to back stacks. I will be doing the Swole stack after the Asteroid.
Oh and if you have not spent countless hours refining your diet and making adjustments for your needs, then put the supps away untill you have. Learn how to get your staples together, Protein, fish oil, bcaa's. One thing is for sure if you can't gain without supps your not going to have much more luck gaining with them.