This is super impressive! Although I must say I used to own an XT with a V20 CPU back in the day for all intents and purposes for me all software and games I wanted to play ‘just worked’. Yes it is faster than the 8088 but that is no problem right? And sure, apparently some games are depending on 4.77Mhz apparently but I never found such a title I guess
Janitor Joe was one of the games I know of that had this issue: https://archive.org/details/msdos_Janitor_Joe_1984 when I tried to run it on a faster machine, you would run out of oxygen and lose almost immediately. Fun game at the right speed, though!