I think it's quite possible that you're a sp-last 6 and you're noticing sp because you're well-aware of how you protect yourself.
[MENTION=4945]EJCC[/MENTION] is right, you can't compare to other people. Consider that you may have much more balanced stackings whereas others might have more skewed ones. If theoretically each person has 30 instinct energy "points", maybe you have 11 sx, 10 so, and 9 sp. And maybe someone else has 15 sx, 13 so, and 2 sp. You'd still be the same stacking but you'd probably be a bit different in terms of how you act things out.
Technically the one surefire source to know will be figuring out what you feel like HAS to be taken care of first. I didn't realize I was Social in part because the instinct feels so second-nature and obvious. And then whatever falls to the wayside, that's your last instinct, even if you still feel strong in it. Maybe try to catch yourself in daily life making choices between the instincts. Or write down a quick summary of your last couple of days, and then analyze it in terms of the instincts. What did you have no problem prioritizing? What was left behind?
For me it would be like:
Friday - class, work on artwork for charity event, complete reading and online quizzes before deadline, go with boyfriend to concert, go home to hang out with family, stay over there for the night.
Saturday - wake up early, consider driving home, discover boyfriend is asleep in the guest room at my parents' so go back to sleep, decline boyfriend's offer to fix my car light because that sounds like a boring thing to do on my one day off, accompany brother to his haircut, get my phone charger from my apartment, get brother to take me by the school bookstore for the test sheet I need for Monday morning, go with brother to used bookstore, drive to a store for him while he is resting to get one more thing he needs, meet up with family for late dinner, talk to brother for a little while then crash.
Sunday - work, buy some fundraiser hot dogs and bring them home for the family, help mom and brother get ready to leave, go with brother on his last-minute store run and use it to find gift for boyfriend, try to cheer up my boyfriend because he had a shitty night yesterday, spend some time for just the two of us, take him for a drive in the countryside in the sports car, spend a little time with my dad, laze around playing on our computers, then finally hole up to study for Monday morning's test. (Edit, test went well!)
You can sort of see how sp stuff always ends up getting shafted in my life, even just in these few days. I'm always leaving my school-related work til the last minute, I tend to sacrifice my own energy and sleep, I tend to forget life-maintenance-related items like my phone charger, and even when my sp boyfriend asked if he could do an sp thing for me, I didn't want to risk it taking time I could use to take care of other things. And so always gets prioritized. Gatherings, restoring harmony, focusing on others, taking part in group efforts. Those priorities are so key to me that I don't even think about prioritizing them; I just think about how to best fit them all in. My second instinct - sx - I think about more in the moment and "work it into" the so structure that segments my life. Trying to find good atmospheres, taking a slower route because I like the drive better, getting absorbed in music, driving fast, stirring up excitement in the relationship, etc. That can be found fairly easily within.
There is a blog called RunningFather with lots of great instinct variant posts, and one tidbit I loved was this:
You could do the same mini-journaling thing but with your life as a whole and see how it turns out - stair steps (sp), eras (sx), or pods (so). And what is left out.