Vertical Total is at the GPU output and cable level, not the firmware level.
Your PlayStation has to add a bigger blanking interval to the video cable, which it cannot do. The signal structure on the cable is what creates the vertical total.
Theoretically, a scan conversion feature within a panel could internally create a large VBI, however, the XL2411P panel does not do this.
You can reduce PlayStation crosstalk by pre-adjusting strobe phase with a computer BEFORE connecting to a Playstation, or using the factory menu instead to configure that. Test strobe phase at 0 and at 100.