If your judgment distribution graph on Screen Evaluation has multiple individual "spikes" like Cloud Strife's hair in FFVII, your dance pad hardware is polling at a low rate.
Fixing this is outside the scope of Simply Love as a StepMania theme. You may need to install drivers for your OS, modify hardware inside your dance pad, or both.
StarlightLumi wrote a guide for modifying L-Tek Dance Pads to poll at 1000 Hz:
https://www.instructables.com/id/Modifying-an-L-tek-Dance-Pad-to-Poll-at-1000hz-on-/
StarlightLumi's L-TEK guide was based on original code and efforts by natano:
https://www.natano.net/blog/2019-12-14-usb-polling-adventure/
sahunt has a guide on modifying Windows to poll at 1000 Hz:
https://www.hackmycab.com/?portfolio=usb-polling
geefr has a wiki page on identifying and troubleshooting USB polling issues in Linux:
https://github.com/geefr/stepmania-linux-goodies/wiki/So-You-Think-You-Have-Polling-Issues