Maybe your body is trying to tell you something?
Possibly just an adjustment period, which may or may not last.
You're looking great now - why take the chance with artificial anything?

Note to self: stop obsessing about the numbers of the scale. What about the numbers on the tape measure, or the clothing in my closet? That's a much better gauge. The more muscle, the more weight, so the scales can deceive, but the clothes and the tape measure don't lie.