Hi Mal,
I made kefir cams before with inconsistent results, 1 batch went hard, 1 batch was like yours, they went gooey in the end (but tasted a bit funky), and 1 batch went soft and gooey in time.
I think it all depends also on the kefir strain and how strong it is, I experimented with upto 12 days old kefir. Older kefir tend to have more potent cultures, mould and spores but it also give more funky taste.
All in all, after a few experiments I went back to DVI.
I still drink the kefir though and it makes good face mask too!