Hey man,
So far I've had a pleasant threshold buzz at 40-50mg, 70mg, a very cool evening on 100mg (effects definitely enhanced by maryjane)...more recently I tried 200mg with a good friend...this produced an experience of a different magnitude to the rest...we took it a bit late, and I couldn't sleep really all night...I was on the cusp of quite an immersive trip...powerful euphoria and mescaline intoxication...not as stimulatory as I expected, but it was late and we were drinking muchos beers...colours very vivid, the floor was crawling gently in fractals...the odd shimmer of an open eyes visual, trying hard to form proper patterns...a definite feeling of power though, am interested what higher doses may hold in store... My friend, who I split the cost of the cactus and limonene with, was impressed at how powerful that dose was...not what he was expecting.
Firstly, do you dry your extract out in an oven at high temps? Maybe try drying them at cooler temps, maybe airing cupboard/room temperature and compare...someone in one of the threads noticed that room temperature evaped extract was more potent at lower doses than higher doses of oven evaped extract.
For a high dose experience however, I will be waiting until myself and my friend are free, and its a nice summer's day, so nature can be explored and appreciated in all its glory, and we will each be taking 500mg, at least to start with. Maybe split 250mg half an hour apart to help the stomach...
Keep us informed though should you decide to venture deeper into Mescalito's realm...