I completely uninstalled ROC, then BOSS and bash patched. Basically trying to go back to a state where the land around Imperial Island has no ROC. This seems to also fixed alot of land tear that I did not mentioned. Once I confirmed the land tears are gone without ROC (and also of course no floating tower), I reinstall ROC and ROC patches and Better Cities ROC patch and installed at the very end. BOSS and Bash patched. It seem to be fixed!