Week 9 is day 63: on a four-week ladder that is week 1 of dose step 3, and — at the seven-day half-life this class runs on — 9 half-lives in. Steady state is about five half-lives, so day 35 is where the concentration stops climbing on its own. Day 63 is 4 weeks past it, which means the level is no longer the variable. That distinction is most of the question: at week 1 of a step, an effect that is still accumulating is indistinguishable from one that is not resolving unless you know which side of day 35 you are on. Reflux follows delayed gastric emptying, so it tends to track meal size, meal timing and posture after eating more closely than it tracks the week number. Dose decisions are made under supervision, and nothing here is medical advice.
The relevant physiology is that gastric emptying slows substantially and then partially normalises with continued exposure at a stable dose.
Anticipating a slower-than-label titration from the start is a legitimate approach and costs only time, since the exposure ceiling is the same.
The practical hierarchy of interventions: slow the titration, reduce meal size, reduce fat, separate fluids from meals, and only then consider symptomatic treatment.
Gastric emptying studies in this class quantify the delay directly and document its attenuation with continued exposure to the long-acting agents.
Slow the titration first. It is the intervention with the best evidence and the lowest cost.