Yep - the IC, RK and RG are the ones I'd dine at too! Haven't ever had a HG in RG hotel yet and haven't been to IC either for HG - but only know a HG that I got rather close with who told me she was put up there before.
I've been to RK too many times now - and with me visiting Kobe too....hmm....looks like I best avoid dining there!
No problems with P Hotel, SH Hotel, E Hotel and the I Hotel on Nathan because I'd never go there otherwise.
By the way, the P Hotel is actually pretty nice all things considered!