@Michal_S I would refer you to the first few posts on Struggling to get to grips with my Samsung controller . These hopefully clarify just what each option in #2093 does, both to the circulating pump and to the heat pump compressor (the manual terminology can be a bit ambiguous). Additional information appears in the Installers Guide https://midsummerwholesale.co.uk/pdfs/ehs-install-guide-samsung.pdf - see p135 in particular, which notes a 1-minute delay to pump stopping with some settings.
Pay particular attention to Helpdesk’s reply reported in post #2 in the above thread, about the compressor behaviour when #2093 is set to 1 - if the roomstat isn’t satisfied even with the compressor at minimum speed, it stays at that speed and the LWT rises above target until the roomstat is satisfied (though that’s my interpretation of their words).
Funnily enough, I’ve never seen my compressor go below 20Hz (though I confess I don’t watch it 24/7 like some people do…
). I can’t explain what’s different - we have the same series HP and controller 
. Maybe we should compare our FSVs side-by-side? (BTW I use a 3rd party wireless roomstat so use #2092 rather than #2093, but the rules are the same for each AFAIK.)
Regarding hysteresis, the Remote Controller thermo switches off at setpoint, and back on when the LWT has dropped ~2deg below this (unless you have #1061 available). I don’t know whether the Samsung Remote Controller applies a bit of 2- or 3-term control as LWT approaches setpoint. Maybe they do and that’s what’s causing the problem - the controller anticipates arrival at setpoint (in order to avoid overshoot) and backs off a bit too quickly so the compressor speed drops too much. I had to “detune” my 3rd party roomstat to avoid exactly the same problem (the TPI cycle rate was too fast for the Samsung controller, but slowing it to 3-4 cycles per hour did the trick).