Netherlands truffles. What am I doing wrong?

Basically I'm having trouble keeping them in my stomach.

The first time I bought some random truffles and chewed on them without any trouble. The trip was very disappointing though

Then I tried buying three boxes of the cheapest truffles and tried to eat them at once. Halfway though I had to vomit, and nothing happened.

Then somebody explained that I need to buy the McSmart brand, and that I should grind the truffles and swallow them with water. He also mentioned that sugar does abosulutely nothing to stop the trip.

I ate a dragon dynamite after grinding it without any problem and got and insane trip.

About 48 hours later I ate one and a half boxes from the same brand. I did vomit a little bit but had a very relaxing and happy trip. I literally felt all my anxiety disappear for a couple of hours. It was lovely.

About three or four days later i tried having another dragon dynamite by crushing the truffles with a mortar and waiting about 12 hours to eat them. I was able to hold them for at least 30 minutes. When I had to vomit I was starting to trip a little bit so I thought they have already done its job, but I had a very weak trip. The odd thing is that about 24 hours later after doing weed I could definetely see some weird colors when closing my eyes.

I feel like I'm wasting more than half my money there, what can I do to get reliable trips without vomiting? (I have always done it with an empty stomach)