diff --git a/Tests/ICCeryUITests/Milestone3UITests.swift b/Tests/ICCeryUITests/Milestone3UITests.swift
index b95584b..8ea1f86 100644
--- a/Tests/ICCeryUITests/Milestone3UITests.swift
+++ b/Tests/ICCeryUITests/Milestone3UITests.swift
@@ -198,15 +198,26 @@ final class Milestone3UITests: XCTestCase {
         }
         XCTAssertTrue(app.buttons["btnPrintAll"].isEnabled)
 
-        // The gallery cell's Print button can sit at the window's bottom
-        // edge where XCUI's automatic scroll-to-visible is inert (#132)
-        // — scroll stage-2 explicitly until the hit point is onscreen.
-        let printPage = app.buttons["btnPrintPage-0"]
-        let stage2 = app.scrollViews["stage-2"]
-        let scrollDeadline = Date().addingTimeInterval(10)
-        while Date() < scrollDeadline, !printPage.isHittable {
-            stage2.scroll(byDeltaX: 0, deltaY: -1)
-            RunLoop.current.run(until: Date().addingTimeInterval(0.2))
+        // The gallery cell's Print button sits at the window's bottom
+        // edge where synthesized scroll-wheel events are inert on the
+        // LazyVGrid (#132). Drag the NSScrollView's vertical AXScrollBar
+        // thumb instead — a real scroll that re-renders the cell onscreen.
+        var printPage = app.buttons["btnPrintPage-0"]
+        let scrollDeadline = Date().addingTimeInterval(15)
+        while !printPage.isHittable, Date() < scrollDeadline {
+            let scroller = app.scrollBars.allElementsBoundByIndex
+                .first { $0.frame.height > $0.frame.width }
+            if let scroller {
+                scroller.coordinate(withNormalizedOffset:
+                    CGVector(dx: 0.5, dy: 0.1))
+                    .press(forDuration: 0.1, thenDragTo:
+                        scroller.coordinate(withNormalizedOffset:
+                            CGVector(dx: 0.5, dy: 0.6)))
+            } else {
+                app.scrollViews["stage-2"].scroll(byDeltaX: 0, deltaY: -1)
+            }
+            RunLoop.current.run(until: Date().addingTimeInterval(0.5))
+            printPage = app.buttons["btnPrintPage-0"]
         }
         if printPage.isHittable {
             printPage.click()
diff --git a/Tests/ICCeryUITests/Milestone4UITests.swift b/Tests/ICCeryUITests/Milestone4UITests.swift
index 66fda1e..6d4bc15 100644
--- a/Tests/ICCeryUITests/Milestone4UITests.swift
+++ b/Tests/ICCeryUITests/Milestone4UITests.swift
@@ -111,16 +111,9 @@ final class Milestone4UITests: XCTestCase {
         }
         app.buttons["btnCalibrate"].click()
 
-        // Trigger strip A.
-        _ = waitFor("btnTrigger", timeout: 20)
-        app.buttons["btnTrigger"].click()
-
-        // Trigger strip B.
-        _ = waitFor("btnTrigger", timeout: 20)
-        app.buttons["btnTrigger"].click()
-
-        // All strips read → Done & Save appears.
-        _ = waitFor("btnDoneRead", timeout: 20)
+        // Trigger each strip until all are read → Done & Save appears.
+        driveStripsUntilDone()
+        XCTAssertTrue(element("btnDoneRead").exists)
         app.buttons["btnDoneRead"].firstMatch.click()
 
         // Averaging panel appears with one pass snapshot.
@@ -186,11 +179,21 @@ final class Milestone4UITests: XCTestCase {
         start.click()
         _ = waitFor("btnCalibrate", timeout: 25)
         app.buttons["btnCalibrate"].click()
-        _ = waitFor("btnTrigger", timeout: 20)
-        app.buttons["btnTrigger"].click()
-        _ = waitFor("btnTrigger", timeout: 20)
-        app.buttons["btnTrigger"].click()
-        _ = waitFor("btnDoneRead", timeout: 20)
+        driveStripsUntilDone()
+        XCTAssertTrue(element("btnDoneRead").exists)
         app.buttons["btnDoneRead"].firstMatch.click()
     }
+
+    /// Clicks Trigger for each remaining strip until `btnDoneRead`
+    /// appears — the button is re-polled each pass so a click that
+    /// races a state transition isn't lost.
+    private func driveStripsUntilDone() {
+        let deadline = Date().addingTimeInterval(40)
+        while !element("btnDoneRead").exists, Date() < deadline {
+            if app.buttons["btnTrigger"].waitForExistence(timeout: 10) {
+                app.buttons["btnTrigger"].click()
+            }
+            RunLoop.current.run(until: Date().addingTimeInterval(0.5))
+        }
+    }
 }