Questions about a homemade ECAY stack

[nodiggitydave]

Hello folks,

Been a while since I posted here!

I just have a few questions about making ECAY stack.

The ECA stack I get from my local bodybuilding shop contains:
Ephedrine: 30MG
Caffeine: 250mg
Aspirin: 150mg

This is from Zion Labs.

I've been thinking of making my own, with less aspirin and caffeine which derives its caffeine from Chocamine and Bioperine. However, all I see online is Kaisen 8mg tablets, where it says the maximum dosage per is 25mg?

Whereas when taken as ECA it says you should not exceed 75mg of E.
Which is correct?

I also found Yohimbine online, it hasn't arrived yet, but was thinking of taking a 5mg capsule each time I take the ECA stack. (2-3 times a day)

Thoughts please.