Well I know different wormers cover different worms and then there is cocci which takes cocci meds. I would start with a fecal.
Yes to all the above. I will check his teethA fecal would be good. Knowing what you might be dealing with and seeing if your wormer worked.
I would drop the molasses, wethers do very well on quality grass hay, loose minerals and maybe some alfalfa hay/pellets to help balance the calcium: phosphorus Ratio...
is he chewing a cud, pooping berries, peeing a steady stream, bright eye and alert?
Does he seem to eat well? check his teeth to besure allis well in there, not preventing him from chewing.ect...
(never stick your fingers in his mouth...they have super sharpe teeth..use something to keep him frombiting down before going in)