Why can I take so much stimulants? Has anyone ever heard of also being immune to stimulant psychosis?

The most methylphenidate (Ritalin) I've taken was 600mg at once, 1300mg in one day or 500mg snorted in one night. Right now I just took 430mg at once.

Amphetamine doesn't do much for me.

Cocaine is like methylphenidate for me.

Crack cocaine I can smoke lots and just feel focus and no high.

I've taken at most 1400mg of Caffeine at once which was the only stimulant I overdosed on.

200mg Ephedrine at once.

10 grams of Ethylphenidate in less than a week or 600mg at once.

1 gram of 3,4-dichloromethylphenidate in a few days. (3,4-dichloromethylphenidate is 7x more potent than methylphenidate).

1 gram of 4-Flouromethylphenidate in a few days of which 100-200mgs I can take at once. (4-Flouromethylphendiate is 3-4 more powerful than methylphenidate).

3-Flourophenmetrazine I've taken 400mg at once and 200mg snorted at once.

I just ordered 10 grams of 4-methylmethylphenidate which is as close to methylphenidate as you can get.

There is absolutely no records of anyone taking these doses what's so ever or even half that. I do however know the LD50's of these drugs which I like to touch a little.

I'm looking for some info maybe there is some out there idk.

Thanks.