I could never get to 40mg on gummies using rosin, They were just a melted mess. I put 6g of rosin in a 25 piece chocolate bar, ~180mg per piece. It was supposed to be for some special party of Veterans The party was a complete bust as all attendees just went to sleep and the food burned on the grill because they forgot they were grilling! I have found that 60mg per piece of chocolate is a good number for my heavy hitters.
What's the max you've been able to use with just oil?