Yeah your experience here is extremely atypical. A mildly inexperienced LSD user who has a smooth and pleasant trip on one hit will, 99% of the time, be totally obliterated by 5 hits, much less 10. Like going from a walk in the park to literal ego death where you forget your own existence as a conscious entity. Most people say it's extremely non-linear, my own experience included.

For me, the length of the trip does noticeably scale with dose, but the potency of the trip itself at peak scales far faster, almost exponentially so.