Why do you want to drop the F 111 at all?
Straps out and back and a good slalom fin and the F111 is very close to an IS.
Size like it fits in between IS111/101, has a bigger range than an IS, easier when slogging.
If you are competing on national/international level you go IS122/101, IS122/111 makes no sense,
If not, keep the F111. The IS111 is closer to the IS122 than F111.
So IS122/F111 makes more sense for me than IS122/IS111.