Maybe you could try Kaimana instead.
I just got back from southern Sumba, the result is quite satisfactory. The simple way is to get to Kalala inn (by late Mr.David Kalala), now run by his wife, Mrs. Johanna Kalala (Mama Jo). This could become the base camp for sleep, bath, eat. Ask Mama Jo about boat, she can provide boat for fishing there, up to Salura (Halura) island. GTs everywhere, redbass. sometimes mackarel and baracuda. Look for low ebb period, high tide is not as good.