And no, it's not merely on a whim of self-doubt; I have those more often than this
Mostly it's with regards to being irrational vs rational. However, I also think that I seek Si more than I've let myself believe in the past; whether it's comfort-seeking behavior, desire for stability, or generally the things I tend to expect from other people without realizing it, Si is definitely one area that I do focus on to some extent and expect reciprocation in. Hard to buy as Si PoLR; it could be due to coming from a heavily-Si family. Also this behavior, whether it's desire for comfort or Si-related expectations of others, is really only salient to any degree when I'm feeling unstable or am in a downturn.
Also I'm not so sure about being Fe dominant. Fe is something I'm "good" at; I can flex my Fe muscles with the best when I want. But it wears me out, it's tiring; I can't be on that all the time.