diff --git a/bot bond sell.py b/bot bond sell.py
index ec8bc7e..c4264c9 100644
--- a/bot bond sell.py	
+++ b/bot bond sell.py	
@@ -46,7 +46,7 @@ def main():
     # pick? Also, you will need to send more orders over time.
     # --- 설정 ---
     BOND_FAIR_VALUE     = 1000  # BOND fair value (고정)
-    BOND_ORDER_SIZE     = 80    # BOND 주문당 수량 (크게 설정해서 체결 기회 극대화)
+    BOND_ORDER_SIZE     = 50    # BOND 주문당 수량 (한도 초과 방지)
     XLF_CONVERSION_FEE  = 100   # XLF 변환 비용
     VALE_CONVERSION_FEE = 10    # VALE 변환 비용
     VALE_ARB_SIZE       = 10    # VALE 차익거래 단위
@@ -58,7 +58,7 @@ def main():
     xlf_state     = "IDLE"
     xlf_pending   = {}
     xlf_direction = None
-    xlf_arb_size  = 0  # 현재 차익거래 수량 추적
+    xlf_arb_size  = 0
 
     # VALE state machine
     # IDLE → BUYING_VALBZ → CONVERTING → SELLING_VALE → IDLE
@@ -66,7 +66,7 @@ def main():
     vale_state     = "IDLE"
     vale_pending   = {}
     vale_direction = None
-    vale_arb_size  = 0  # 현재 차익거래 수량 추적
+    vale_arb_size  = 0
 
     state         = StateManager()
     om            = OrderManager(exchange)
@@ -111,8 +111,8 @@ def main():
             sell_size = base_size
 
         # 포지션 한도 초과 방지
-        buy_size  = min(buy_size,  100 - position)
-        sell_size = min(sell_size, 100 + position)
+        buy_size  = max(0, min(buy_size,  100 - position))
+        sell_size = max(0, min(sell_size, 100 + position))
 
         if buy_size > 0:
             bid = next_id()
@@ -325,16 +325,16 @@ def main():
                 vale_direction = None
 
         elif message["type"] == "ack":
-            # XLF 변환 ack 처리
+            # XLF 변환 ack 처리 - om.positions 직접 수정
             if xlf_state == "CONVERTING":
                 print("  XLF 변환 완료 → 매도 시작")
                 if xlf_direction == "BASKET_TO_XLF":
                     # 변환: BOND -3, GS -2, MS -3, WFC -2, XLF +10
-                    om.update_position("BOND", -1, -3)
-                    om.update_position("GS",   -1, -2)
-                    om.update_position("MS",   -1, -3)
-                    om.update_position("WFC",  -1, -2)
-                    om.update_position("XLF",  -1, xlf_arb_size)
+                    om.positions["BOND"] -= 3
+                    om.positions["GS"]   -= 2
+                    om.positions["MS"]   -= 3
+                    om.positions["WFC"]  -= 2
+                    om.positions["XLF"]  += xlf_arb_size
                     xlf_state = "SELLING_XLF"
                     oid = next_id()
                     exchange.send_add_message(
@@ -343,11 +343,11 @@ def main():
                     xlf_pending[oid] = xlf_arb_size
                 elif xlf_direction == "XLF_TO_BASKET":
                     # 변환: XLF -10, BOND +3, GS +2, MS +3, WFC +2
-                    om.update_position("XLF",  -1, -xlf_arb_size)
-                    om.update_position("BOND", -1, 3)
-                    om.update_position("GS",   -1, 2)
-                    om.update_position("MS",   -1, 3)
-                    om.update_position("WFC",  -1, 2)
+                    om.positions["XLF"]  -= xlf_arb_size
+                    om.positions["BOND"] += 3
+                    om.positions["GS"]   += 2
+                    om.positions["MS"]   += 3
+                    om.positions["WFC"]  += 2
                     xlf_state = "SELLING_BASKET"
                     for sym, qty in [("BOND", 3), ("GS", 2), ("MS", 3), ("WFC", 2)]:
                         oid = next_id()
@@ -356,13 +356,13 @@ def main():
                         )
                         xlf_pending[oid] = qty
 
-            # VALE 변환 ack 처리
+            # VALE 변환 ack 처리 - om.positions 직접 수정
             elif vale_state == "CONVERTING":
                 print("  VALE 변환 완료 → 매도 시작")
                 if vale_direction == "VALBZ_TO_VALE":
                     # 변환: VALBZ -size, VALE +size
-                    om.update_position("VALBZ", -1, -vale_arb_size)
-                    om.update_position("VALE",  -1,  vale_arb_size)
+                    om.positions["VALBZ"] -= vale_arb_size
+                    om.positions["VALE"]  += vale_arb_size
                     vale_state = "SELLING_VALE"
                     oid = next_id()
                     exchange.send_add_message(
@@ -371,8 +371,8 @@ def main():
                     vale_pending[oid] = vale_arb_size
                 elif vale_direction == "VALE_TO_VALBZ":
                     # 변환: VALE -size, VALBZ +size
-                    om.update_position("VALE",  -1, -vale_arb_size)
-                    om.update_position("VALBZ", -1,  vale_arb_size)
+                    om.positions["VALE"]  -= vale_arb_size
+                    om.positions["VALBZ"] += vale_arb_size
                     vale_state = "SELLING_VALBZ"
                     oid = next_id()
                     exchange.send_add_message(