I never liked dealing with those floaters because I always felt I lost material in the filter. I just let the solvent come back to room temp, evap half off and then refreeze. If you do that the floaters tend to actually stick to the glass in my experience.
Anyhow, I have always recrystallized my spice with naphtha (using the same kind of solvent I do pulls with). Is there any benefit to a heptane re-x with ACRB or does naphtha provide about the same results? I don't like the brand of Naphtali I currently have now, it takes over twice as long to evaporate as the old Ace naphtha I used to use. It also has a slightly different scent than the Ace naphtha, I think different brands may use different mixtures of hydrocarbons? I wonder if the brand of VM+P I am using now has a little move xylene or some other chemical in it that causes the discrepancy in evaporation times as well as the different smell. Next time I need more solvent I am gonna use Ace again despite many people using the brand I do (MSDS is clean as well, obviously)
tl;dr - Do you think heptane would provide noticeably different re-x results on some dirty acacia goo than simply using naphtha?