After a night and a day, the crystals were dry. They weighed 0.85 gr and the other batch (of a lesser quality), which I haven't weighed yet, will be about 0.15 gr. Approximately 1 gr out of 150 grams of MHRB whole bark

That sounds about right for whole bark pieces. Well done!

Thanks a lot I thought it was a little bit low? Especially since I did 5 pretty long acid baths and 5 naphtha pulls, but I guess it won't get any higher with the whole bark?

If you want let it set for weeks or months and then run a pull from it. The results are usually lower quality but waste not want not.