^^^^i agree, its a disaster. My max was 9ml, and i take 4g a night of phenibut, both GABA-B agonists. Not sure if that raises my tolerance or results in an additive effect but i woke up my girl to altert her of the potential problem. "I took too much of drug don't let me fall asleep". Of course she fell asleep shortly after but the issue stands it was too much.
The difference with GHB/its prodrugs and benzos is that fatal doses are easily. Take enough 1,4-BD and you'll die, its not that forgiving. In concert with benzos its worse.
Ive mixed benzos and 1,4-bd plenty, but not more than 5-6ml. Becareful. I woke up half dead on a ventilator 6 days after combing benzos (phenazepam and etizolam) with etaqualone. 9ml of pure 1,4-BD (without benzos, but with alcohol and 4g phenibut, both being very notable) had me worried for my safety. Mixing gabaergics almost killed me. The dose response curve of 1,4-BD is geometric, where 9ml may feel 3 times stronger than 6ml.