Student or Learner
We usually say: well-protected, do xxx well.
But is it common to say : well-do something, well-doing something?
E.g. This case well protects your watch. This case is well protecting your watch. (the "well" here serves as an adverb).
No. The watch is well-protected by the case. The case protects your watch well.
Neither of the two you posted.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.