This may explain it-
Sensitization and Allergy to Cannabis sativa Leaves in a Population of Tomato Sensitized Patients.
Sensitization and Allergy to Cannabis sativa Leaves in a Population of Tomato (Lycopersicon esculentum)-Sensitized Patients.
Most of the " hippie" decarbing recipes are a bit low temperature-wise.
"
A conversion of THC acids into the pharmacologically active phenols-chemically a decarboxylation process (separation and release of carbon dioxide)-is accomplished most effectively by heating. A heating for five minutes to 200 to 210°C was found to be optimal for decarboxylation (Brenneisen 1984) Under these conditions, THCA was completely converted into neutral THC, while avoiding the subsequent oxidation to cannabinol (CBN). When marijuana is smoked and temperatures of 600° C are reached, obviously only a few seconds are sufficient for decarboxylation."
THC Limits for Food, Part II (a good read, by the way)
200 C = 392F, 210C= 410F. I haven't found the Brenneisen study yet, but i think the "snip" says enough.
Glad you made it back! 
Granny