Yup, most of those were SG's. As a lot of people have more or less mentioned above, this might be because you are tucking one hand more than the other. (Are you tucking to a roll setup position?) However, I think trying to fix this by attacking that issue directly will be pretty tough. I would try launching the loop more upstream. Right now, it's popping straight up, which is good for air, but (as I bet you noticed) is sometimes hard to stick and hard to rotate. If you wait a tiny bit longer before springing and tucking, your boat will have more time to rotate while it's low, then it will also snap faster once it does get airborne.
Usually loops get twisted when they're hard to pull through, because that's when you really need that pulling stroke, and any sort of imbalance gets magnified. If you really want to get serious, you could consider a zero degree offset paddle so that the double handed overhead pull still comes through straight, but that's probably overkill.
However, you should be psyched, because that's a hard spot to loop. I'd say that at those levels, it's harder than flatwater. Great challenge. (Flatwater practice should also help you with this straightness issue.)