1) You put a 1AC coach in any train it would not run empty for sure.. during peak season it will be full
2) Regarding the 2 trains u mentioned would certainly work well but both trains dont have room for extra coach augmentation. So 1AC at cost of any other class is not desirable according to me. Also, HWH-CSTM has lot of trains with First AC. Janeshwari has 1.5 coaches, 1 Full coach in HWH-CSTM Mails (Via ALD,NGP), Duronto
And honestly speaking, we should not have multiple class in Railways. We are...
more... into world of Lean Manufacturing where you have to simplify things and we are complicating it. More classes means that you have more inventory overhang, more vendors, different type of facilities at Origin and terminating stations, Different type of coaches, colours, composite coaches... Oh.. We should get away with it. This is only my personal view and not a critism as such.
And one more thing.. I am not entitled to be called sir. My name is Vilok and you can call me by that name.