The default Kontakt velocity curve is often too linear for stage pianos. Go into the instrument's settings and set the curve to "Expressive" or draw a custom curve. You want the mezzo-piano (medium soft) range to be extremely sensitive. HD libraries have the data there; you just need your MIDI keyboard to access it. Is It Worth the CPU Hit? Let's address the elephant in the room. High-definition, multi-gigabyte piano libraries are resource hogs.
A single instance of the with 20 velocity layers, half-pedaling, and sympathetic resonance enabled can consume 2-3 GB of RAM and 15-20% of a modern CPU core. Ultimate Stage Pianos Hd Kontakt
Do your research on which specific vendor offers the "Ultimate" edition (check forums like VI-Control or Gearspace for the latest Giga-sampler comparisons). Ensure you have a fast NVMe SSD drive to house the samples, as streaming 50GB of HD piano data requires speed. The default Kontakt velocity curve is often too