I utilized AP "without" the addition of P-Slin for several months and felt I had great results. However, when I began supplementing P-Slin in to the mix I could, without doubt, notice a huge difference in my workout performance. Difficult to explain but it's like once I completed my warm up sets, a switch was flipped and my intensity came alive more so than when I supplemented AP alone. My strength and endurance have improved quite a bit in a very short time span.
While supplementing with P-Slin and/or AP, I would definately try and switch your primary carbohydrate source to Oats for a workout or two and wait "at least" 1.5 hours for digestion before you begin your actual workout.
Do not skimp on the amount of carbs consumed while supplementing P-Slin. The least amount should be 60g and perhaps even more based on the individual. I personally consume approx. 95g, pre workout.