Almost no one uses the term swim nowadays. I never quite understood the purpose ;-P
Anyways. I have had 30 or 40 (?) experiences where I purposefully took less than breakthrough dose. Just enough to get to me to edge and still be able to fully exist in everyday 'reality'. To be able to open up my eyes and look at our world (it is magnificent btw). Note - these almost breakthrough doses were really hard at the start. For most ppl this is the least pleasant part of the journey. It only becomes 'smooth sailing' after you break through.
The experiences I had varied wildly with some being extremely strange. For example I had two extremely weird ones where with my eyes closed I had ZERO CEVs (!!!) and I felt as if I am very, very close (for the lack of a better phrase) to a different person somewhere on our planet (1st - some old lady talking to someone in a marketplace in South America, the other one a cyclist somewhere in Germany). I heard them speaking, the background commotion as if I was right there (I'm kind of guessing the old lady in SA one but I know German and recognized the language in the 2nd experience straight away). Another example was when I vaped DMT surrounded by plants. I was certain they were trying to communicate with me. Super weird to say the least ;-)
I'm still trying to find a pattern and will continue to do so. This is pure speculation on my side but I'm thinking this is the only way to even have a chance to scrape the surface of the DMT dimension (if it's a dimension at all, we'll most likely never know). Aim is to be right in between the two worlds...
I do understand that basically the goal of taking DMT is the breakthrough but I like approaching things in a different way :-)
In the end of the day I'm quite sure that my brain is simply trying to make some sense in a flood of information after taking DMT. This is probably absolute lunacy on my side and I will most likely fail ;-)
I'm still going to try to understand nonetheless...
Be inquisitive and always question things...