I know there are cvars such as director_short_finale, director_finale_stage_delay, and director_finale_panic_waves but none of these seem to work even with sm_cvar. I've checked my cfgs and none of them are conflicting with the cvars. I might be missing something unless there is a plugin that solves my problem.
tl;dr Campaign finale waves between tanks drag on for too long, director cvars do not work even with the correct variables.