The strike zone during post frontal conditions diminishes from several feet to only a few inches dictating the use of a slower, more direct presentation. In these situations the plastic lizard, Texas rigged craw worm, or jig and pork may be more effective. If the fish take a swing at a spinnerbait but just don't take it, try a jig and pork or plastic lizard. If you catch a fish or two on a Rat L Trap but notice that they are hooked by the back hook and are only lip hooked, this is an indication that they are just not very active and is a clue that a slower presentation could be more productive. The hardest fish to catch of the day is the very first one.
Adjustments can be very slight or subtle sometimes.
If a fish takes a swipe at a spinnerbait and does not take it, it is not because he could not catch it if he so desired, he simply is telling you that 1. Current weather conditions are often a factor determining how fish will react to certain lures. On cloudy days prior to or during cold fronts the fish will often be scattered and actively feeding and chasing lures permitting you to use fast moving lures. Conversely on bright days and especially during post frontal conditions the strike zone of the fish will not be as large and smaller baits or possibly the lizard or jig will be a better choice. Water clarity plays a big part in lure selection.