The figures now are just a blob of colors with poor titles and bloated aspect. If you are an expert on the exact topic of your publication, you would be able to find the secret message hidden inside. So there is almost no advantage between having that figure and having a table showing the raw data: a figure serves exactly the opposite scope, make evident the messagge hidden behind data.
First) the colors. Why on Earth you have this mild but oversaturated range of colors if your scale is going symmetrically from +value to -value? these figures are figures that are hard to read, while figures should be popping out. There is simmetry, please have a strong contrast without saturation, no one sane of mind will look at your data in black and white, so you can use something like the RdBu scale (Red for positive, Blue for negative, white for zero)
Second) the colors. Why the colorscale is continuous, while the data seems not (yes, spatial discretization may play a role ... but what about resoultion of the measurments?)? and the scale truncated but not limited going from +32 to -32 ... please, use values readable from humans, like +30 to -30. Base 8 is nice, but leave it to your DAC sensors.
Third) the colors. They carry an overload of information, but what you want to show is "something". Please add some isolines in your plot (it is easy to do if the colorscale is a slightly desaturated RdBu instead of this very saturated colormap). And if the isolines have a label, plus dashed if negative and continuos if positive, you are good to go for the 1% of the world still printing papers and accessing papers only in black&white.
Fourth: the title must be in a standard format, whatever standard your peers are using, then please avoid writing "time": either it is obvious that it is a timestamp, or you have to find another format of timestamp. Do not strive making your best to be as concise as possible. Just be concise.
Fifth (bonus) if you use a lighter colormap, you can plot the grid with some dashed lines, to improve readability.
Example of colormap:
(taken from here, please note that all the text in this figure is bad, that the grid is not plotted but at least colormap and isolines are what would make much better your figures)