First, what do you mean by "kernel size"? The amount of RAM occupied by the kernel? The size of the vmlinuz file? The size of the text, data and BSS segments in the vmlinuz file?
If you only removed modules from the kernel (i.e. components that are marked with an "m"), the size of the vmlinuz file is not affected. Kernel modules are, by definition, not inside this file.
As a first step, you could compare your current .config file with .config.old and see what is actually different.
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