One thing to suggest is from install media when kernel is loaded it uses lz compression, but when installed in HDD it uses gz compression, which is definitely bigger in size. xz or lz should be used in vmlinuz.
One thing to suggest is from install media when kernel is loaded it uses lz compression, but when installed in HDD it uses gz compression, which is definitely bigger in size. xz or lz should be used in vmlinuz.