hey man, if you're still having problems i think you're comparing it to real time rather than game time. i had this problem but just switching that over will solve all your problems.

if you have autosplit activated, you don't need to do any manual inputs with livesplit. it will do everything for you. you can activate this in the edit splits section of your livesplit

Run should end as soon as the 4th red core is incinerated