--qp 28 and --qpmax 38 is indeed very low ...
try 18 to 22 (e.g --crf 18 --qpmax 28)
Actually, --cqp option uses the same quantizer for all P-frames (I is 1.4 times less and B is 1.3 times more by default, see --ipratio and --pbratio)
--crf uses a nominal quantizer, and makes it vary according to the motion present in the scene. In high motions, x264 will raise the quantizer to give the same visual quality than still scenes at the nominal quantizer.
Hence the following conclusion : crf gives rather the same _visual_ quality than cqp but with a smaller filsize.
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