well incase anyone was still interested I tested stock and underclocked both before and after v6 and found my answer. The images are stock, 1036 MHz underclocked, v6 stock, and v6 1036 MHz underclocked. This was all using cfq I/o scheduler and interactive governor. the 1036 MHz underclocked ranked just below the stock n3 according to antutu and above my stock test. I know everyone has their own opinions with benchmarking and what app is used but atleast this gives me my answer.
Samsung Note 3 - Xposed modified Kit Kat NC4
Samsung GT-I815 - PAC-man 23.0.0