The subsequent re-x has to use less solvent. Can be 1/2 to 1/5 of the amount used for previous re-x. Dissolve everything and wait to cool down so it has the color you wish. Then pour off and freeze. If the result is oily, too much solvent has been used, can be done again.

I use toluene for initial extraction and use everything. If more selective naptha is used, you should use everything that goes through. If you don't mind the taste.