never wash crystals, thats very inneficient and not to mention you can lose your yield.. if you wash, then wash with sodium carbonate, and you wash the solvent when dmt is dissolved in it, not when its in crystal form
I think your problem is very likely to be your smoking method.. Ive read countless of times people having trouble with the bulb.. Even the machine is quite harsh IMO (though some people do like it).. Either get yourself a vaporgenie or smoke in a bong, with the dmt sandwiched between some herbs or ashes