Just felt the need to contribute Old player here, been playing the game since 00/01 (skipped a few), using knaps tactics since 2017.
Here is my story so far in FM 2020:
I have been mainly using FIRE 4321 P103 (ID 1491) with NO changes!!
For SUS, occasionally using !!!!!!!!!!!!!!!!!!!!!!FM20.4.1MississippiKnapVOL4141SUS to kill the game later on, but just to keep player condition up , ensure you're leading at least with 2 goals (preferably 3 or more) because it can backfire. For narrower leads you can use Positive mentality for SUS, maybe even Cautious (not experimented enough yet).
Only First season I used Tea 4321 OX P103 and I remember it worked just as well (FIRE wasn't published yet I guess).
I think I'll keep using the FIRE 4321 P103 tactic forever, unless another tactic is proven to consistently overperform on a reliable tactic testing database & league. Too afraid to change at this point
I always micro-manage: watch key highlights, use team talks and shouts, praise good performances, manage the training.
This just a contribution , not a comparison, never really gave other tactics an opportunity yet. Because this one so far gave me all kind of success I could have Big thanks and respect to @knap for all the contribution!