Chill, bro There is a general bug in MSFS: Button trim speed depends on FPS for all planes. Measure trim time (0-100% on the HUD), then enable frame limiter and measure again! It's different, reverse proportiknal with fps. This is true FOR ALL Planes! This is dumb, it should depend on the time duration the button was pressed, independent of FPS! So maybe the only way for the JustFlight guys to make a usable trim button was to make the trim very sensitive, so it can be trimmed in a reasonable time. As a side effect the tailplane position indicator cannot be used to check trim state, we need to enable "hud in cocplkpit" and then you can checkthe 0% trim before takeoff.
And God forbid, use an axis contrlol for pitch trim like the saitel trim.whreel. move 1 percent (few mm) and it's at full trim. Move 10% plane stalls/spins/disintegrates!