I think live jam is great and all, but you have to be at least confident of your live skill to do something decent. Plus if you aren't accustomed to odd time signatures like steevio or some others you'll end muting sections in 2-4-8-16 bar aniway, because this is the signature our ears is most accustomed listening to dance music. If you are accustomed to playing samba, tribal rhytms or even jazz.. well yeah, do something live. But since i think you wrote you come from trance, chances are your reasoning will be in 4/4 even live.
you'll never attain that skill though if you dont have a go in the first place. when i started i didnt have much choice, i played live right from the start, my first gig after only producing for about one year was all done on a 909 / 101 / 303 and some effects live. its not that difficult to do a basic live jam.
the thing you say about muting sections in the usual places depends alot on how long your most definable loop is.
a lot of minimal techno tradionally was based on half-bar loops, and these do not push you into a strict regime of 8/16/32 on long sections, because your brain is less able to keep count on such short loops, this is why that type of techno is so hypnotic.
4 beat loops less so, but it is still no problem to throw in a 15 or 30 bar section and bring in the element of supprise for the change. however as soon as you start making clearly defined 2 and 4 bar loops, it usually sounds wrong if you change on an odd number of bars.
right now i'm making a tune that has a clearly defined 4 bar repetition, and its much harder for me to add the element of supprise.
the thing is if you start with say a 1 bar loop, and build from there adding ornaments in the obvious places like 2 / 4 / 8 then you are creating a cage for yourself. you have the choice at that stage to do something different, and if you do, your tune can take a totally different direction. if you dont there is only one outcome, predictability. in some case that might not be a bad thing, but for every tune ??