When you stock HBG make sure they are 1/3 the length of most of the bass present. LMB will eat those that are smaller.
The clear water indicates low natural fertility and low fish production ability. So establish a pellet feeding program to improve fish growth and hopefully a higher density.
IMO you are fishing these small ponds to frequently. It appears you have created hook smart fish. Look through these threads in the LMB Archives to learn about hook smart fish. There is a section on: Largemouth Catchability - Hook Smart - Hook Shy
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=255372#Post255372This is another topic from those archives about overfishing. the smaller the pond the more overfishing becomes a concern.
Too Much Fishing Pressure?
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=21676#Post21676Spend time reading and learning what other information is in the Common Pond Q&A Archives to learn more about fish management and help your situation. Spend more pond time building a couple fish traps & using them, focus on monitoring and recording numbers & sizes caught and then feeding the fish for improved growth. Feeding the fish is a very good way to grow lots of larger fish in small ponds such as yours.
Use Google to search for Pond Boss forum topics you want to read about. use: pond boss forum fish trap
as search words to learn about fish traps for ponds. Here is one link to get you started.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=259781#Post259781 
