I've just updated it, perhaps the actual PS1 is slow to respond. This happens on emulation too if jumps are too large, most likely due to the CPU and usage of load delay slots. However, the type of controller being used also seemed to matter. In digital mode it works for me but not analog etc.
You could try the kernel patch for the Quick Turn and see if that makes a difference, however, it might not work with peripherals like Gameshark or PSIO due to the space in ram it occupies. The calls and jumps should be shorter now, even on the non KERNEL versions. I had to make a fix because of the game overwriting memory.
Out of curiosity I'm gonna burn a few discs as well and see if there are any differences. I hope it all turns out, and thank you for trying my mod 
