No more coats since Friday and after five days in the warm it's finally stopping feeling quite so 'waxy'.
I'm starting to realise tung oil != tru-oil. It isn't building up, it just keeps soaking in. Note this is pure tung oil, not a modified one.
It looks good at the moment, but is unprotected and the finish is uneven as in some bits matt, some shiny, most in-between. I also worry it's getting a little darker with each coat.
I think I'll park the slurry idea and instead go for applying a coat of microcrystalline clear satin wax or two, once it feels completely unsticky, which I guess will be a couple of days now as most of it feels OK. I think a high gloss would highlight imperfections and the holes in the timber.