The flowers are very nice, but I think your plant is straight Echeveria, not a xSedeveria, because the petals are straight and the flower itself is tubular. Unfortunately it's not a plant that I recognize. I wouldn't worry about the leaves on the stalk drying up, there's always a bit of that once the flowering process is well underway. Watering once a week sounds pretty good for a pot that size in strong light.
