Chris, I'm thinking that your overall stocking numbers of LMB are very low (seems like 100 2-3" LMB and 5 adults?) for a 1.2 acre pond, and as such, you may not see or catch them very easily until more growth is achieved.
To summarize your situation, I would say you had some kind of existing fish population in the pond upon you acquiring it. From there, without doing anything to effect major changes in that existing population except for maybe removing all bullheads you catch, your supplemental stockings of other fish have been very light if the goal was to create a larger impact.
Some general thoughts:
1) Increase cover in the pond for newly born fish.
2) Add more native bluegill hopefully in the 4-5" plus size range; this could be 500 or more fish. Coppernose Bluegill could be good.
3) Start a feed program which will boost spawning and congregate fish so you can observe more.
