The computer is more than capable of handling the modded game. Since you created the folder, there should not be any issue with that. Run the LAA applet again, since your SH4.exe is write-enabled then, and make certain it has the check mark in the Large Address Aware field tick box. If you have Intermediate Mode, then it would show "True" un the "Current" column. The group with the Kuma is the Tokyo Express run, and runs most nights, with at least 4 Kaya Transports and 2 escorts at a minimum, but you might find as many as 6 Kaya and 6 DD, along with another light cruiser.. There are also several cover forces that are slated to bombard Henderson Field, and then attempt to cover the Tokyo Express return trip, so if they're all going northwest, you might have as many as a dozen destroyers, some DE and the Kaya, in addition to several CL. If you pick the right night to be in the area, you encounter the battle groups, along with their DD escorts.
I cannot think of a reason for you to have Save load issues though. There are no minefields near there, and there are no shore guns in the area (not enough time to set them up). What boat are you driving, and what were your orders when you started the patrol? I'll try to replicate.
