Electroshocking doesn't bring up every fish, nor does every shocked fish float. Some sink.
I doubt you lost all 200 LMB, but do agree you should have seen more during the shocking.
Also, I don't think that 10" fish from fingerlings in 6 months is unreasonable, and 1 lb or 13" at a year old is not unrealistic.
If you were harvesting those 10" LMB, I think you were taking out your original stockers.
Not sure that is the case. Remember, these fish are almost 2 years old now....NO WAY they should only be 10". Even back when under 10" fish were being harvested last year, they were 18 months old. Those fish should have been pushing 14" to 15". Again, a lake just down the road, double stocked like mine at the exact same time is averaging 3 lbs. fish. Biggest fish out of my lake has been 1lbs. 5oz. Something went terribly wrong.