No guys! You have made too much mess here:
1. Slava was not any Kirov's back-up but simply less expensive cruiser type. It should be obvious for two times smaller warship. Both types were to be produced in the same time as new well balanced cruiser fleet.
2. Very interesting situation also emerged with new Soviet destroyers in those days. Soviets introduced two pararell designs: Sovremenny and Udaloy not due to "redundancy" but because there was not possible to meet all requirements in one unversal hull under 10000 tons displacement. Therefore 956 is primarly anti-ship platform and 1155 is first and foremost ASW one.
3. SSG Julliet can't be treated as SSGN Echo-II back-up. Note Julliet was a diesel sub and thus it was no match for nuclear Echo-II in any respect. Echo-IIs were to hunt US carriers on open ocean and Julliet was in fact coastal defense platform.
4. As for too many submarine types I advice you to take into account one basic fact that in the Soviet Union
four construction bureaus and shipyards built nuclear subs for Red Navy simultaneously as opposed to one or two in US. Partially that is why more models were designed all the time.
5. If your data about 65K model top speed are correct I can't see any reason to use 65M torp because both versions would share identical performance but 65M is far less safe design.
Overally plenty of similar weapons and warship types in USSR was caused by many factors. Not only mythical "redundancy".
