Hello -I am new to this sight and also live in SE NM. I currently fish Sumner lake, and experience some the same lowering water issue. I have found I just move out a little deeper the areas I fish. I have had a lot of success throwing texas rigged plastics, square bill cranks, and spinnerbaits. I fished this last weekend and the smallmouth were hammering the soft plastics.
I am originally from AZ and have found the techniques I used in AZ don't seem to work as well in NM, and the drop shot is one of them. I know it has to work and wonder if i am using the righ color. Westy worms worked in AZ, but I have not have much success in NM.
Have you been fishing any other lakes besides the Butte?