Well I can't answer as to if the guarantee is still in effect (I am not affiliated with Primordial), but if you look into logs for SD-LV and the general love for it that has spread across the internet, and in particular here, you will see PP is very legit and this SD clone is no exception. You should see really good results from it.
Also, I wasn't questioning your diet, more so making the suggestion. As you can imagine, forums get alot of "Im not gaining" type comments only to later find out that their 1200 calorie diet is to blame. Glad you have yours in check, those are some impressive numbers. Good luck with the cycle if you choose to do it!