Through my practice I've noticed gross (as in blatant or obvious, not as in vulgar) "surface" thoughts and then subtler and subtler "layers" of thought behind them. The obvious thoughts I find relatively easy to detach from and observe, but I'm finding it tricky to detach (disassociate) from and observe the more subtler thought forms. These thought forms tend not to be fully-formed internal monologues as such, more vague / less clearly defined but in a way more fundamental, less superficial than the surface layers. They feel like they're closer to the "core" "me" or self, like an essence in a way. I feel that I'm probably interpreting them this way because I'm finding it difficult to detach from them, but that could also work the other way, that I'm finding it difficult to detach because they are closer to this core sense of self/ego? I'd appreciate any seasoned practitioners' thoughts on this.