O.K. So, from 3/7 to 4/13, 5 weeks, your bp dropped from 4 lbs, 4 oz (1927g) to 3 lbs, 10 oz (1644 g). That's a loss of almost 15% of his body weight. He doesn't look bad to me, but that seems like a lot of weight to lose so quickly.
Unless taking a large dump was part of that equation. It's a challenge to get equivalent weights on snakes that eat & defecate on a sporadic basis.
Rudeness is the weak man's imitation of strength. Eric Hoffer(1902 - 1983)