If they hit a Rattle Trap or Red Eye Shad on your first trip, I always find the next few trips to the same pond will always result in less fish on any lipless crank with rattles as they are probably seeing lipless cranks and hearing rattles all day if it is Pre Spawn-Spawn Time...
Kill the Rattles, Throw a 1/8-1/4 spinnerbait to cover the flats, since water is muddy, Hammered blades may help, but try and find some clear water, warmer water, moving water from an inflow....But if it is void of cover (We have alot of Golf Course Ponds in Fl. Like that) they often get tough to catch during the spawn but not every fish spawns at the same time. Look at the shoreline and get an idea of where the deepest part of the Pond is, and even if it appears the entire pond is the same depth, usually one shoreline or strech of a corner will show that there may be a break point or drop off and usually they will be cruising back and forth in the area or areas that have bottom contour changes or highways......If you see that one side of the pond has some bolders, hard bottom etc..assume the bottom will be the same, and Bass will always look to spawn in a sheltered area or corner even in a featureless pond (Alwayssome features, Fountains, water pipes, shoreline Reeds or Tall Trees for shade etc.)
Northern end warms first, I would start there and go with a silent presentation and use a neutral color like black or if Tilapia or Sunfish are main forrage, match that pattern as that will usually do the trick. strike King and Sebile make some goode Lipless cranks that are silent...Also, give a Rapala Floating Minnow or Flat Rap in a 9 size a try, that is a pond killer and so is a 6" Trick worm or 7.5" Ribbon Tail on a split shot rig...
Hope that helps, I fish alot of ponds, I have a 2 acre pond loaded with bass near my house and there are weeks where I will struggle to catch fish, but if persistant, you will crack the code and feel good when you figure it out. There is always a way, and often doing what others are not works best....