I don't remember anyone being told that someone's pagh was anything but strong. On the other hand, I would expect that one might say that someone has a trouble pagh, or an uncertain pagh. Pagh is often not something specific, but rather a tool that allowed the vedek to draw attention to something about the lay person, some problem or some strength that they had. In the pilot, Opaka use pagh to note something that Sisko must address. At the time, he was uncertain about his role and his desire to stay with Starfleet. To replenish his pagh meant to find conviction and purpose again.