Let's be honest: 800-1000 meters is an unreal range for island and jungle. The fighting was at close range.
The Shinhoto Chi-Ha cannon penetrates 50-mm armor at a meeting angle of 60 ° at 500 meters, that is, Sherman could theoretically be destroyed at 500 meters, that is, at a real combat distance.
If memory serves correctly, the USA moved all its Jumbo Shermans promptly out of Europe after VE Day in May 1945, in preparation for the invasion of Honshu and Kyutu. I doubt if they would have done so, unless there was some chance of success with these tanks.
Japan was on its knees, not least because of the US blockade of the Japanese islands. I know some Japanese boats got through under darkness, but not many
However, gameplay trumps RL. Right?
If you have played the map
Beach Assault{?}, I would not predict a successful outcome for a game played on such limited scenarios.