If Naphtha has dropped everything out of it, then it should be clear.
So as long as it is cloudy, it there is still stuff to sink down.
Furthermore:
How much Naphtha do you have that is freezed?
Naphtha will hold ~ 140 mg of DMT for every 100 ml STILL AT -20 °C!
So if you have 500 ml of Naphtha sitting in the freezer, it will never release the last 0,7 g of Spice. Reduce it further down to get also most of this out.
Second:
If you heated the Naphtha in a water bath and threw it on room temperature soup, this is like heating nothing.
I did the calculation once, but dont remember where. Hydrocarbons like Naphtha have a very tiny heat capacity. So if you pair them with water of a different temperature, it will mix nearly at the temperature of water.
Example:
1L of 20 °C Water + 1L 100 °C Naphtha = ~ 25 °C Naphtha
I did not calculate now, but you CAN do it with the heat capacities cp and you will see something like this. As you possibly heated it only to 40 °C and have much less Naphtha each pull than water, it was like pulling at room temperature. At room temperature it will take up MUUUUCH less spice in the same amount of time like at 60 °C. Regular 'GOOD' Naphtha will boil between 60 - 80 °C. So heat your soup to 60 °C and throw your Naphtha in. This will get most out of your Soup within very short time.
If you have 1 L of soup then use 200 ml Naphtha x 3 and heat the soup to 60 °C meanwhile. If you only got a tiny yield then the Spice is still sitting inside the aqueous soup!
(Or you have too much Naphtha to drop it out, remember: ~ 140 mg per 100 ml of Naphtha still at - 20 °C)