No one really talks about the physical feeling of spice on the body, is it normal to get a heavy body load when smoking sub breakthrough doses?
I get a pretty uncomfortable body load like a heavy warmth...its nice in a way but kind of makes me uneasy during the experience.

I don't know how normal it is but I do get a heavy body load just about every time I smoke a sub breakthrough dose. I actually find it quite comforting. I'm assuming the body load is there for the breakthrough doses too only with everything going on in my mind I don't notice it at all.

that sounds pretty normal for a sub-breakthrough. Straddling the worlds can be very uncomfortable at times

on a big enough dose there is a point though where my body is just gone from my awareness completely

yeah absolutely normal..even the strange face mutation sensation and a light heartrace..you'll get used to it

Awesome I was a little worried I may have botched my extraction or I was a freak of nature.
I also experienced a warm point in the center of my forehead, I kept reaching up to see if I was bleeding haha!
It was like a glowing of my third eye

Sometimes I'm irrationally hot. Sometimes irrationally cold. If I take way too much or burn it, I can sometimes get some nausea. All in all though, I love the way my body feels on DMT. Often very light, and feeling like it's being pumped with positive energies.

Well put, I feel the same thing. I dont really consider what I feel a body load, its usually more of a body ultimate relaxant that puts me right in the moment where I can enjoy the feeling of just being and usually I feel really good about myself and very powerful.
Where I do get a bad body load is if I drink any alcohol before smoking spice, then I have to sit and wait for the spice to wear off and it feels terrible to me, so I've only done that once or twice.
I get really sensitive to hot or cold, but mostly cold so I try to smoke within a comfortable temp only. I get nausea usually if I don't have a very clean bowl that I'm smoking out of.

Hot, cold, tremors, extreme lassitude or even paralysis, the feel of vibrating on a molecular level like getting zapped with low/moderate level electrical stimulation all over, surges of adrenaline-like power, etc. I get it every time.

More often than not, these physical sensations are diffuse over my whole body, but concentrate or emanate from areas that are suspiciously similar to the Chakras.

I think the tantric/yogic methods are on to something... it just takes them decades to get where we can in a matter of seconds. Understanding is another idea altogether.

Is "body load" the same as body buzz or body high? I've never been clear on the distinction, or hip with the terminology.

Its hard for me to explain it is a really really nice feeling like I am really body stoned and just melting into the chair but at the same time its a little too heavy like I don't have control over whether or not I want to move its almost like I'm pinned down ( I'm not I have stood up and walked around a few times).
I think its more of a fear of letting go.
Back in high school I misused lady salvia ALOT and now I can't even touch salvia or I freak out.
Thats what happens when you disrespect such powerful tools I guess.
A lot has changed since high school too when I had no fear, no worries, no one I really cared about but myself.
Now I have a family and I think a lot of the fear of blasting off comes from worrying I won't come back, even though I know I will, its still in the back of my mind.
Salvia taught me a rough lesson thats for sure now I hope one day I can go all the way with Spice...
I've only had one really strong experience on spice, I don't really consider it a full breakthrough but I was definitely somewhere deeper than I had been previously.
It was utterly beautiful I saw reality as an entity that loved me, in a way no one could ever love another person, much deeper. It showed me strands of DNA and much more, I was at peace and felt so amazing....
yet I am still afraid to go further.

The best thing to do is just to breathe and relax...