Since you say the shine juice is failing, can you explain what it is you think it should do? I believe that shine juice is a mixture of BLO and shellac, correct? On the bottom of an end grain piece, it will be sucked in until the piece is saturated. Depending on the wood, you may see the juice oozing out of the outside bottom of the piece. When it finally hardens, which could take weeks, you would likely be able to polish it to a nice sheen. All this presupposes that you sanded or scraped the bottom to a good finish before applying the shine juice.
Face grain/side grain bowls are more forgiving in terms of how much finish they soak up, but given that shine juice is a penetrating finish, expect to apply many coats over a period of time to get a nice finish.