diff --git a/python/Bag4.py b/python/Bag4.py
index 8ad51cc..6a284d9 100644
--- a/python/Bag4.py
+++ b/python/Bag4.py
@@ -517,8 +517,8 @@ def generate_zpl_dataflex(
 ) -> str:
     """
     Row 1 (from zero): QR code, then item name (rotated 90°).
-    Row 2: smaller Lot, then expiry at the next X, then item code.
-    Text is ^A@R (90° CW); the next line under Lot is +X, not +Y.
+    Row 2: expiry, then Lot at the next X, then item code.
+    Text is ^A@R (90° CW); the next line under expiry is +X, not +Y.
     Label and QR use lotNo from API when present, else batch_no (Bxxxxx).
     Light preprint (~JA/~RO) is sent before labels; full ~JR recovery is only for「打袋重設」.
     """
@@ -539,9 +539,9 @@ def generate_zpl_dataflex(
     host_id = _dataflex_host_identification_sgd_prefix(job_order_id)
     if exp_esc:
         row2 = f"""^FO0,200
-^A@R,40,40,{font_regular}^FD{label_esc}^FS
-^FO42,200
 ^A@R,40,40,{font_regular}^FD{exp_esc}^FS
+^FO42,200
+^A@R,40,40,{font_regular}^FD{label_esc}^FS
 ^FO88,200
 ^A@R,88,88,{font_bold}^FD{code}^FS"""
     else:
@@ -700,8 +700,8 @@ def generate_zpl_label_small(
     else:
         qr_data = f"QA,{batch_no}"
     exp_zpl = f"""
-^FO150,230
-^A@N,36,36,{font}^FD{exp_esc}^FS""" if exp_esc else ""
+^FO150,194
+^A@N,25,25,{font}^FD{exp_esc}^FS""" if exp_esc else ""
     return f"""^XA
 ^CI28
 ^PW500
@@ -712,9 +712,9 @@ def generate_zpl_label_small(
 ^FO10,110
 ^BQN,2,6^FD{qr_data}^FS
 ^FO150,110
-^A@N,48,48,{font}^FD{code}^FS
-^FO150,175
-^A@N,40,40,{font}^FD{label_line2_esc}^FS{exp_zpl}
+^A@N,34,34,{font}^FD{code}^FS
+^FO150,156
+^A@N,28,28,{font}^FD{label_line2_esc}^FS{exp_zpl}
 ^XZ"""
 
 
@@ -724,9 +724,10 @@ LABEL_IMAGE_W = 720
 LABEL_IMAGE_H = 530
 LABEL_PADDING = 23
 LABEL_FONT_NAME_SIZE = 42
-LABEL_FONT_CODE_SIZE = 49
-LABEL_FONT_BATCH_SIZE = 34
-LABEL_FONT_EXPIRY_SIZE = 34
+# Item code / lot / expiry ~70% of original size so all three fit under the name.
+LABEL_FONT_CODE_SIZE = 34
+LABEL_FONT_BATCH_SIZE = 24
+LABEL_FONT_EXPIRY_SIZE = 24
 LABEL_QR_SIZE = 210
 
 
@@ -1229,8 +1230,8 @@ def save_laser_last_count(date_str: str, count: int) -> None:
 
 
 LASER_PUSH_INTERVAL = 2  # seconds between pushes (like sample script)
-# Click row with 激光機 selected: send this many times, delay between sends (not after last).
-LASER_ROW_SEND_COUNT = 3
+# Click row with 激光機 selected: one payload. Sending 3 queued 2–3 old bags after a job change.
+LASER_ROW_SEND_COUNT = 1
 LASER_ROW_SEND_DELAY_SEC = 3
 
 
@@ -2272,6 +2273,17 @@ def open_dataflex_stop_window(
 
     def stop() -> None:
         stop_event.set()
+        # Cancel labels already sitting in the DataFlex buffer so the next job
+        # does not print 2–3 leftover bags of the previous job.
+        ip, port = session.printer_ip, session.printer_port
+
+        def _cancel_buffer() -> None:
+            try:
+                send_dataflex_preprint_reset(ip, port, force=True)
+            except Exception:
+                pass
+
+        threading.Thread(target=_cancel_buffer, daemon=True).start()
         stop_win_ref[0] = None
         clear_topmost()
         try: