Not an earth guy, so I can't give you any ideas on your pond leaking problem... You may want to put together more details and try posting in the appropriate subforum on here...
A swimming pool test kit can be used, but isn't completely accurate. If your pH is too low, it can affect fertility and can affect the species of fish that will do well or even survive in your pond. Your lack of a bloom may be because of a low pH...
It depends on the species, but some species or more suseptable to suspended particulate than others. It can also affect the phytoplankton make up of your pond as the suspended clay can block out sun light.
Your stocking numbers for CNBG and RES seem a little on the high side, but it depends on what your goals are? What are your goals for your pond? If you are going for trophy sunfish, you may have stocked too many sunfish and stocked the bass too late. If you are going for trophy bass, you may be well on your way...
