I've had 3 hoops of the same size now for about 2 months. I've been practicing with one in each hand and one at the waist (or hips/knee) and I've had the 3 on my waist easily (to the right and left, I can get one to go to chest level with 2 at the waist).
Yesterday, I bought 4 more in a new size and when I tried them at the waist this morning, wow, did it not go well.
What's the best way to add, in your opinion? One at a time, or just throw them on and let your body learn?
I'm sort of in the same boat, though I've been focusing more on what I can do with two body hoops (or minis + 1). The size makes such a difference! I'm guessing your new ones were smaller? I have trouble multi-hooping on the body with my 1/2" 125psi 30" hoops... I can body hoop with one at that size, but I was really hoping to bridge the multi/mini gap so I could have more options without changing hoops... alas, it isn't happening yet. Though I think too large can be harder in multiple too.
You should start with two. Practice with them on these 4 parts of your body: waist, knees, chest, hands above the head. So for example, practice waist & chest; then waist and hands; then waist and knees; then knees and chest... etc. You see what Im saying? Once your comfortable with two hoops in all those 4 places on your body add a third hoop. Practice one on waist, chest, hands, etc... then add the 4th: Have one on your knees, one on the waist, one on the chest, one on the hands.
Or if you're asking the best way to add hoops on while your already hooping, the kick start works pretty well. Or just start them all on your waist and split them up from there.