I'm confused. What do you mean?
-Are you proposing that that ROM you're linking to is more stable than this ROM? If so it's a bit offensive to the op.
-Are you saying you've flashed it and it doesn't work properly? Well, since it's made for s8 then it's kinda obvious
-Are you offering this as help for this ROM to be developed further? Well, then a GitHub site is the best, tag the op, then hope he'll implement the changes.
-Do you want somebody here to take that ROM you're linking to and make it available/tweaked/adjusted to be compatible with s8+? If so you're totally out of line. Ask that developer first. Perhaps get sources. Then post it as a request in general questions.
Or even pm this developer (again after clearing it with the original developer) and ask. Perhaps it's only me but I find this a bit offensive if this is the case.