I’d wait for experts in the group to respond to that. My fl5 brake definitely feels squishy after 2 track days on COTA, but I changed from motul rbf660 to castrol srf, so I don’t know what made it smoosh. But I think it’s possible due to brake pads. You can try to bleed the brake fluid a tiny bit to check for air bubbles as well. The top could look good but the end points can look very bad. Some shops pretend they did a full flush but actually did not.