Re. self-defense torpedoes, you mentioned a planing hull and high max speed. For a light FAC with a mostly AShM-based weapon fit as you have designed, the traditional anti-sub defense is a good turn of speed, good eyes, and full flank ahead to outrun the torpedoes.
Consider that such a small boat would likely be considered a low-priority target for a submarine on the prowl, and is no threat in and of itself, it would rarely warrant a torpedo.
I also have doubts on the stern boat ramp, not functionally, but from a mission POV. In a Soviet-oriented context, do you really need your missile boat to be fitted out for search-and-seizure? Or do you have other specific tasks in mind?
If you get rid of the RHIB well, you could move some of the heavier weaponry from amidships to the stern, move the stack back a bit to balance the design. Just my 2c. since others here are certainly much more versed than I in the fine art of ship design.
Don't take this bad because I find your concept really interesting, but it looks like you started from a much bigger ship and trimmed down to get where you are (the original version with VLS just removed and 3D radar array is a clue).
IMO you're nearly there in terms of weapons fit, but you might want to rearrange and lighten the structure to reach the kind of speeds you have in mind.
I would have suggested taking a look at IRL designs with a similar mission profile, but I can't find comparable contemporary (late 80s) western designs.
The French Combattante-III and German Type-143 Albatros are on the old side (derivative 70s designs), the more modern Danish Flyvefisken and Malaysian Lakmanasa are much slower. Maybe the Finnish Rauma design?