Don't!
- It's a bad plan to dose on a potent drug the first time combined with another major drug, because you don't know how you will react.
- 25i can be dangerous and lethal, it can influence body temperature which ecstasy can as well.
- 1400 ug is a VERY big dose even if you don't combine it with anything. People have died from less than that, although reactions do vary a lot. Without combining under 500 ug - like 300 - is way more reasonable.
- An hour is not always enough to wait for a pill to kick in, depending on binders and fillers but especially if it turns out it is not bunk but another drug than MDMA, like say PMA which is dangerous and takes longer to kick in.
So skip the 25i otherwise it is dangerous.
I'm afraid this comes too late, disappointed noone responded to this.