Well....the 'rest' is obviously still in solution! Here are a couple of suggestions (in order of preference):
1) Remove solvent by rotary evaporation then do a 'proper' slow recrystalization.
2) Add a huge excess of acetone, filter the resulting mess and do a 'proper' slow recryst
What i refer to a 'proper' recryst is as follows:
Place residue in a 1L RB flask with enough MeCN to just cover. Add a reflux condensor and bring to ~100C. Add MeCN in 10ml portions, and allow to come back to reflux before adding more. Stop addition when solid is all in solution. Reflux for another couple of minutes and then stop heating.
At this point i would allow it to return to RT slowly. Then, leave it uncovered overnight and the next morning you SHOULD see nice fluffy white product. If not, then add acetone dropwise until you see lasting turbidity, and refrigerate for a few hours. If you still see nothing. Then add slightly more acetone and repeat.
When it comes to recrystalization, patience and good technique are very important in producing nice pure product.
Fan of shulgin