I never personally tried to exceed the 2C-B (HCL) dosage higher than 20mg oral because it was too much, but everybody knows that every individual reacts different to every substance. I speak about lab GC/MS-tested 2C-B giving a result of 96% of purity. I really think that single-dosages exceeding 40mg are WAY TOO HIGH for 99,9% of the people.
Take in consideration that every 2mg's added to a dosage of 15mg of 2C-B makes a huge difference on the final experience.
Is there a way you can confirm the exact version and purity of the compound you are trying? That would be very helpful to try to troubleshoot this
I personally trip once every two-three months, commonly without adding MDMA. You might try to add MDMA to the experience, using a low dosage (rounding 90mg) and taking the 2C-B at almost the final of the MDMA experience. This combination was highly studied on the 60s by psychoanalysts, as stated on Alexander Shulgin's Pikhal. I've tried it several times with very good success, it adds a really intense/dynamic/colorful/thinking deepness side to the entire experience.
In our local 'trip-group' we never experience something like this with 2C-B HCL, we are more than 6 persons taking it once every two months.
Love